From 52176c99dc1aa2aac1841c8a39892a86d5328026 Mon Sep 17 00:00:00 2001
From: Lucas Santos <lhs.santoss@gmail.com>
Date: Sun, 2 Jul 2023 20:19:41 +0200
Subject: [PATCH 1/4] test_runner: add Date to the supported mock APIs

signed-off-by: Lucas Santos <lhs.santoss@gmail.com>
---
 doc/api/test.md                              | 446 +++++++++-
 lib/internal/priority_queue.js               |   4 +
 lib/internal/test_runner/mock/mock_timers.js | 583 ++++++++-----
 test/parallel/test-runner-mock-timers.js     | 813 ++++++++-----------
 4 files changed, 1127 insertions(+), 719 deletions(-)

diff --git a/doc/api/test.md b/doc/api/test.md
index b310cf993f7e8f..6cd360da4f41b6 100644
--- a/doc/api/test.md
+++ b/doc/api/test.md
@@ -496,7 +496,7 @@ test('spies on an object method', (t) => {
 ### Timers
 
 Mocking timers is a technique commonly used in software testing to simulate and
-control the behavior of timers, such as `setInterval` and `setTimeout`,
+control the behavior of timers, such as `setInterval` and `setTimeout`
 without actually waiting for the specified time intervals.
 
 Refer to the [`MockTimers`][] class for a full list of methods and features.
@@ -505,7 +505,7 @@ This allows developers to write more reliable and
 predictable tests for time-dependent functionality.
 
 The example below shows how to mock `setTimeout`.
-Using `.enable(['setTimeout']);`
+Using `.enable({ apis: ['setTimeout'] });`
 it will mock the `setTimeout` functions in the [node:timers](./timers.md) and
 [node:timers/promises](./timers.md#timers-promises-api) modules,
 as well as from the Node.js global context.
@@ -522,7 +522,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
   const fn = mock.fn();
 
   // Optionally choose what to mock
-  mock.timers.enable(['setTimeout']);
+  mock.timers.enable({ apis: ['setTimeout'] });
   setTimeout(fn, 9999);
   assert.strictEqual(fn.mock.callCount(), 0);
 
@@ -546,7 +546,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
   const fn = mock.fn();
 
   // Optionally choose what to mock
-  mock.timers.enable(['setTimeout']);
+  mock.timers.enable({ apis: ['setTimeout'] });
   setTimeout(fn, 9999);
   assert.strictEqual(fn.mock.callCount(), 0);
 
@@ -575,7 +575,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
   const fn = context.mock.fn();
 
   // Optionally choose what to mock
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
   setTimeout(fn, 9999);
   assert.strictEqual(fn.mock.callCount(), 0);
 
@@ -593,7 +593,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
   const fn = context.mock.fn();
 
   // Optionally choose what to mock
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
   setTimeout(fn, 9999);
   assert.strictEqual(fn.mock.callCount(), 0);
 
@@ -603,6 +603,220 @@ test('mocks setTimeout to be executed synchronously without having to actually w
 });
 ```
 
+### Dates
+
+The mock timers API also allows the mocking of the `Date` object. This is a
+useful feature for testing time-dependent functionality, or to simulate
+internal calendar functions such as `Date.now()`.
+
+The dates implementation is also part of the [`MockTimers`][] class. Refer to it
+for a full list of methods and features.
+
+**Note:** Dates and timers are dependent when mocked together. This means that
+if you have both the `Date` and `setTimeout` mocked, advancing the time will
+also advance the mocked date as they simulate a single internal clock.
+
+The example below show how to mock the `Date` object and obtain the current
+`Date.now()` value.
+
+```mjs
+import assert from 'node:assert';
+import { test } from 'node:test';
+
+test('mocks the Date object', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['Date'] });
+  // If not specified, the initial date will be based on 0 in the UNIX epoch
+  assert.strictEqual(Date.now(), 0);
+
+  // Advance in time will also advance the date
+  context.mock.timers.tick(9999);
+  assert.strictEqual(Date.now(), 9999);
+});
+```
+
+```js
+const assert = require('node:assert');
+const { test } = require('node:test');
+
+test('mocks the Date object', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['Date'] });
+  // If not specified, the initial date will be based on 0 in the UNIX epoch
+  assert.strictEqual(Date.now(), 0);
+
+  // Advance in time will also advance the date
+  context.mock.timers.tick(9999);
+  assert.strictEqual(Date.now(), 9999);
+});
+```
+
+If there is no initial epoch set, the initial date will be based on 0 in the
+Unix epoch. This is January 1st, 1970, 00:00:00 UTC. You can set an initial date
+by passing a `now` property to the `.enable()` method. This value will be used
+as the initial date for the mocked `Date` object. It can either be a positive
+integer, or another Date object.
+
+```mjs
+import assert from 'node:assert';
+import { test } from 'node:test';
+
+test('mocks the Date object with initial time', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['Date'], now: 100 });
+  assert.strictEqual(Date.now(), 100);
+
+  // Advance in time will also advance the date
+  context.mock.timers.tick(200);
+  assert.strictEqual(Date.now(), 300);
+});
+```
+
+```js
+const assert = require('node:assert');
+const { test } = require('node:test');
+
+test('mocks the Date object with initial time', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['Date'], now: 100 });
+  assert.strictEqual(Date.now(), 100);
+
+  // Advance in time will also advance the date
+  context.mock.timers.tick(200);
+  assert.strictEqual(Date.now(), 300);
+});
+```
+
+You can use the `.setTime()` method to manually move the mocked date to another
+time. This method only accepts a positive integer.
+
+**Note:** This method will execute any mocked timers that are in the past
+from the new time.
+
+In the below example we are setting a new time for the mocked date.
+
+```mjs
+import assert from 'node:assert';
+import { test } from 'node:test';
+
+test('sets the time of a date object', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['Date'], now: 100 });
+  assert.strictEqual(Date.now(), 100);
+
+  // Advance in time will also advance the date
+  context.mock.timers.setTime(1000);
+  context.mock.timers.tick(200);
+  assert.strictEqual(Date.now(), 1200);
+});
+```
+
+```js
+const assert = require('node:assert');
+const { test } = require('node:test');
+
+test('sets the time of a date object', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['Date'], now: 100 });
+  assert.strictEqual(Date.now(), 100);
+
+  // Advance in time will also advance the date
+  context.mock.timers.setTime(1000);
+  context.mock.timers.tick(200);
+  assert.strictEqual(Date.now(), 1200);
+});
+```
+
+If you have any timer that's set to run in the past, it will be executed as if
+the `.tick()` method has been called. This is useful if you want to test
+time-dependent functionality that's already in the past.
+
+```mjs
+import assert from 'node:assert';
+import { test } from 'node:test';
+
+test('runs timers as setTime passes ticks', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  const fn = context.mock.fn();
+  setTimeout(fn, 1000);
+
+  context.mock.timers.setTime(800);
+  // Timer is not executed as the time is not yet reached
+  assert.strictEqual(fn.mock.callCount(), 0);
+  assert.strictEqual(Date.now(), 800);
+
+  context.mock.timers.setTime(1200);
+  // Timer is executed as the time is now reached
+  assert.strictEqual(fn.mock.callCount(), 1);
+  assert.strictEqual(Date.now(), 1200);
+});
+```
+
+```js
+const assert = require('node:assert');
+const { test } = require('node:test');
+
+test('runs timers as setTime passes ticks', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  const fn = context.mock.fn();
+  setTimeout(fn, 1000);
+
+  context.mock.timers.setTime(800);
+  // Timer is not executed as the time is not yet reached
+  assert.strictEqual(fn.mock.callCount(), 0);
+  assert.strictEqual(Date.now(), 800);
+
+  context.mock.timers.setTime(1200);
+  // Timer is executed as the time is now reached
+  assert.strictEqual(fn.mock.callCount(), 1);
+  assert.strictEqual(Date.now(), 1200);
+});
+```
+
+Using `.runAll()` will execute all timers that are currently in the queue. This
+will also advance the mocked date to the time of the last timer that was
+executed as if the time has passed.
+
+```mjs
+import assert from 'node:assert';
+import { test } from 'node:test';
+
+test('runs timers as setTime passes ticks', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  const fn = context.mock.fn();
+  setTimeout(fn, 1000);
+  setTimeout(fn, 2000);
+  setTimeout(fn, 3000);
+
+  context.mock.timers.runAll();
+  // All timers are executed as the time is now reached
+  assert.strictEqual(fn.mock.callCount(), 3);
+  assert.strictEqual(Date.now(), 3000);
+});
+```
+
+```js
+const assert = require('node:assert');
+const { test } = require('node:test');
+
+test('runs timers as setTime passes ticks', (context) => {
+  // Optionally choose what to mock
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  const fn = context.mock.fn();
+  setTimeout(fn, 1000);
+  setTimeout(fn, 2000);
+  setTimeout(fn, 3000);
+
+  context.mock.timers.runAll();
+  // All timers are executed as the time is now reached
+  assert.strictEqual(fn.mock.callCount(), 3);
+  assert.strictEqual(Date.now(), 3000);
+});
+```
+
 ## Test reporters
 
 <!-- YAML
@@ -1576,37 +1790,52 @@ Mocking timers is a technique commonly used in software testing to simulate and
 control the behavior of timers, such as `setInterval` and `setTimeout`,
 without actually waiting for the specified time intervals.
 
+MockTimers is also able to mock the `Date` object.
+
 The [`MockTracker`][] provides a top-level `timers` export
 which is a `MockTimers` instance.
 
-### `timers.enable([timers])`
+### `timers.enable([enableOptions])`
 
 <!-- YAML
 added:
   - v20.4.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/48638
+    description: Updated parameters to be an option object with available APIs
+                 and the default initial epoch.
 -->
 
 Enables timer mocking for the specified timers.
 
-* `timers` {Array} An optional array containing the timers to mock.
-  The currently supported timer values are `'setInterval'`, `'setTimeout'`,
-  and `'setImmediate'`.  If no value is provided, all timers (`'setInterval'`,
-  `'clearInterval'`, `'setTimeout'`, `'clearTimeout'`, `'setImmediate'`,
-  and `'clearImmediate'`) will be mocked by default.
+* `enableOptions` {Object} Optional configuration options for enabling timer
+  mocking. The following properties are supported:
+  * `apis` {Array} An optional array containing the timers to mock.
+    The currently supported timer values are `'setInterval'`, `'setTimeout'`, `'setImmediate'`,
+    and `'Date'`. **Default:** `['setInterval', 'setTimeout', 'setImmediate', 'Date']`.
+    If no array is provided, all time related APIs (`'setInterval'`, `'clearInterval'`,
+    `'setTimeout'`, `'clearTimeout'`, and `'Date'`) will be mocked by default.
+  * `now` {number | Date} An optional number or Date object representing the
+    initial time (in milliseconds) to use as the value
+    for `Date.now()`. **Default:** `0`.
 
 **Note:** When you enable mocking for a specific timer, its associated
 clear function will also be implicitly mocked.
 
-Example usage:
+**Note:** Mocking `Date` will affect the behavior of the mocked timers
+as they use the same internal clock.
+
+Example usage without setting initial time:
 
 ```mjs
 import { mock } from 'node:test';
-mock.timers.enable(['setInterval']);
+mock.timers.enable({ apis: ['setInterval'] });
 ```
 
 ```cjs
 const { mock } = require('node:test');
-mock.timers.enable(['setInterval']);
+mock.timers.enable({ apis: ['setInterval'] });
 ```
 
 The above example enables mocking for the `setInterval` timer and
@@ -1615,12 +1844,36 @@ and `clearInterval` functions from [node:timers](./timers.md),
 [node:timers/promises](./timers.md#timers-promises-api), and
 `globalThis` will be mocked.
 
+Example usage with initial time set
+
+```mjs
+import { mock } from 'node:test';
+mock.timers.enable({ apis: ['Date'], now: 1000 });
+```
+
+```js
+const { mock } = require('node:test');
+mock.timers.enable({ apis: ['Date'], now: 1000 });
+```
+
+Example usage with initial Date object as time set
+
+```mjs
+import { mock } from 'node:test';
+mock.timers.enable({ apis: ['Date'], now: new Date() });
+```
+
+```js
+const { mock } = require('node:test');
+mock.timers.enable({ apis: ['Date'], now: new Date() });
+```
+
 Alternatively, if you call `mock.timers.enable()` without any parameters:
 
 All timers (`'setInterval'`, `'clearInterval'`, `'setTimeout'`, and `'clearTimeout'`)
 will be mocked. The `setInterval`, `clearInterval`, `setTimeout`, and `clearTimeout`
 functions from `node:timers`, `node:timers/promises`,
-and `globalThis` will be mocked.
+and `globalThis` will be mocked. As well as the global `Date` object.
 
 ### `timers.reset()`
 
@@ -1677,7 +1930,7 @@ import { test } from 'node:test';
 test('mocks setTimeout to be executed synchronously without having to actually wait for it', (context) => {
   const fn = context.mock.fn();
 
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
 
   setTimeout(fn, 9999);
 
@@ -1696,7 +1949,7 @@ const { test } = require('node:test');
 
 test('mocks setTimeout to be executed synchronously without having to actually wait for it', (context) => {
   const fn = context.mock.fn();
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
 
   setTimeout(fn, 9999);
   assert.strictEqual(fn.mock.callCount(), 0);
@@ -1716,7 +1969,7 @@ import { test } from 'node:test';
 
 test('mocks setTimeout to be executed synchronously without having to actually wait for it', (context) => {
   const fn = context.mock.fn();
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
   const nineSecs = 9000;
   setTimeout(fn, nineSecs);
 
@@ -1735,7 +1988,7 @@ const { test } = require('node:test');
 
 test('mocks setTimeout to be executed synchronously without having to actually wait for it', (context) => {
   const fn = context.mock.fn();
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
   const nineSecs = 9000;
   setTimeout(fn, nineSecs);
 
@@ -1748,6 +2001,48 @@ test('mocks setTimeout to be executed synchronously without having to actually w
 });
 ```
 
+Advancing time using `.tick` will also advance the time for any `Date` object
+created after the mock was enabled (if `Date` was also set to be mocked).
+
+```mjs
+import assert from 'node:assert';
+import { test } from 'node:test';
+
+test('mocks setTimeout to be executed synchronously without having to actually wait for it', (context) => {
+  const fn = context.mock.fn();
+
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  setTimeout(fn, 9999);
+
+  assert.strictEqual(fn.mock.callCount(), 0);
+  assert.strictEqual(Date.now(), 0);
+
+  // Advance in time
+  context.mock.timers.tick(9999);
+  assert.strictEqual(fn.mock.callCount(), 1);
+  assert.strictEqual(Date.now(), 9999);
+});
+```
+
+```js
+const assert = require('node:assert');
+const { test } = require('node:test');
+
+test('mocks setTimeout to be executed synchronously without having to actually wait for it', (context) => {
+  const fn = context.mock.fn();
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+
+  setTimeout(fn, 9999);
+  assert.strictEqual(fn.mock.callCount(), 0);
+  assert.strictEqual(Date.now(), 0);
+
+  // Advance in time
+  context.mock.timers.tick(9999);
+  assert.strictEqual(fn.mock.callCount(), 1);
+  assert.strictEqual(Date.now(), 9999);
+});
+```
+
 #### Using clear functions
 
 As mentioned, all clear functions from timers (`clearTimeout` and `clearInterval`)
@@ -1761,7 +2056,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
   const fn = context.mock.fn();
 
   // Optionally choose what to mock
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
   const id = setTimeout(fn, 9999);
 
   // Implicity mocked as well
@@ -1781,7 +2076,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
   const fn = context.mock.fn();
 
   // Optionally choose what to mock
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
   const id = setTimeout(fn, 9999);
 
   // Implicity mocked as well
@@ -1815,7 +2110,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
   const nodeTimerPromiseSpy = context.mock.fn();
 
   // Optionally choose what to mock
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
   setTimeout(globalTimeoutObjectSpy, 9999);
   nodeTimers.setTimeout(nodeTimerSpy, 9999);
 
@@ -1842,7 +2137,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
   const nodeTimerPromiseSpy = context.mock.fn();
 
   // Optionally choose what to mock
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout'] });
   setTimeout(globalTimeoutObjectSpy, 9999);
   nodeTimers.setTimeout(nodeTimerSpy, 9999);
 
@@ -1865,7 +2160,7 @@ import assert from 'node:assert';
 import { test } from 'node:test';
 import nodeTimersPromises from 'node:timers/promises';
 test('should tick five times testing a real use case', async (context) => {
-  context.mock.timers.enable(['setInterval']);
+  context.mock.timers.enable({ apis: ['setInterval'] });
 
   const expectedIterations = 3;
   const interval = 1000;
@@ -1897,7 +2192,7 @@ const assert = require('node:assert');
 const { test } = require('node:test');
 const nodeTimersPromises = require('node:timers/promises');
 test('should tick five times testing a real use case', async (context) => {
-  context.mock.timers.enable(['setInterval']);
+  context.mock.timers.enable({ apis: ['setInterval'] });
 
   const expectedIterations = 3;
   const interval = 1000;
@@ -1931,7 +2226,8 @@ added:
   - v20.4.0
 -->
 
-Triggers all pending mocked timers immediately.
+Triggers all pending mocked timers immediately. If the `Date` object is also
+mocked, it will also advance the `Date` object to the furthest timer's time.
 
 The example below triggers all pending timers immediately,
 causing them to execute without any delay.
@@ -1941,7 +2237,7 @@ import assert from 'node:assert';
 import { test } from 'node:test';
 
 test('runAll functions following the given order', (context) => {
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
   const results = [];
   setTimeout(() => results.push(1), 9999);
 
@@ -1953,8 +2249,9 @@ test('runAll functions following the given order', (context) => {
   assert.deepStrictEqual(results, []);
 
   context.mock.timers.runAll();
-
   assert.deepStrictEqual(results, [3, 2, 1]);
+  // The Date object is also advanced to the furthest timer's time
+  assert.strictEqual(Date.now(), 9999);
 });
 ```
 
@@ -1963,7 +2260,7 @@ const assert = require('node:assert');
 const { test } = require('node:test');
 
 test('runAll functions following the given order', (context) => {
-  context.mock.timers.enable(['setTimeout']);
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
   const results = [];
   setTimeout(() => results.push(1), 9999);
 
@@ -1975,8 +2272,9 @@ test('runAll functions following the given order', (context) => {
   assert.deepStrictEqual(results, []);
 
   context.mock.timers.runAll();
-
   assert.deepStrictEqual(results, [3, 2, 1]);
+  // The Date object is also advanced to the furthest timer's time
+  assert.strictEqual(Date.now(), 9999);
 });
 ```
 
@@ -1985,6 +2283,92 @@ triggering timers in the context of timer mocking.
 It does not have any effect on real-time system
 clocks or actual timers outside of the mocking environment.
 
+### `timers.setTime(milliseconds)`
+
+<!-- YAML
+added:
+  - REPLACEME
+-->
+
+Sets the current Unix timestamp that will be used as reference for any mocked
+`Date` objects.
+
+```mjs
+import assert from 'node:assert';
+import { test } from 'node:test';
+
+test('runAll functions following the given order', (context) => {
+  const now = Date.now();
+  const setTime = 1000;
+  // Date.now is not mocked
+  assert.deepStrictEqual(Date.now(), now);
+
+  context.mock.timers.enable({ apis: ['Date'] });
+  context.mock.timers.setTime(setTime);
+  // Date.now is now 1000
+  assert.strictEqual(Date.now(), setTime);
+});
+```
+
+```js
+const assert = require('node:assert');
+const { test } = require('node:test');
+
+test('setTime replaces current time', (context) => {
+  const now = Date.now();
+  const setTime = 1000;
+  // Date.now is not mocked
+  assert.deepStrictEqual(Date.now(), now);
+
+  context.mock.timers.enable({ apis: ['Date'] });
+  context.mock.timers.setTime(setTime);
+  // Date.now is now 1000
+  assert.strictEqual(Date.now(), setTime);
+});
+```
+
+#### Dates and Timers working together
+
+Dates and timer objects are dependent on each other. If you use `setTime()` to
+pass the current time to the mocked `Date` object, the set timers with
+`setTimeout` and `setInterval` will **not** be affected.
+
+However, the `tick` method **will** advanced the mocked `Date` object.
+
+```mjs
+import assert from 'node:assert';
+import { test } from 'node:test';
+
+test('runAll functions following the given order', (context) => {
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  const results = [];
+  setTimeout(() => results.push(1), 9999);
+
+  assert.deepStrictEqual(results, []);
+  context.mock.timers.setTime(12000);
+  assert.deepStrictEqual(results, []);
+  // The date is advanced but the timers don't tick
+  assert.strictEqual(Date.now(), 12000);
+});
+```
+
+```js
+const assert = require('node:assert');
+const { test } = require('node:test');
+
+test('runAll functions following the given order', (context) => {
+  context.mock.timers.enable({ apis: ['setTimeout', 'Date'] });
+  const results = [];
+  setTimeout(() => results.push(1), 9999);
+
+  assert.deepStrictEqual(results, []);
+  context.mock.timers.setTime(12000);
+  assert.deepStrictEqual(results, []);
+  // The date is advanced but the timers don't tick
+  assert.strictEqual(Date.now(), 12000);
+});
+```
+
 ## Class: `TestsStream`
 
 <!-- YAML
diff --git a/lib/internal/priority_queue.js b/lib/internal/priority_queue.js
index 22f89a90ef07f1..e61cc04c101b7c 100644
--- a/lib/internal/priority_queue.js
+++ b/lib/internal/priority_queue.js
@@ -38,6 +38,10 @@ module.exports = class PriorityQueue {
     return this.#heap[1];
   }
 
+  peekBottom() {
+    return this.#heap[this.#size];
+  }
+
   percolateDown(pos) {
     const compare = this.#compare;
     const setPosition = this.#setPosition;
diff --git a/lib/internal/test_runner/mock/mock_timers.js b/lib/internal/test_runner/mock/mock_timers.js
index 1ff6489885fe30..142c5cca498050 100644
--- a/lib/internal/test_runner/mock/mock_timers.js
+++ b/lib/internal/test_runner/mock/mock_timers.js
@@ -8,27 +8,31 @@ const {
   ArrayPrototypeAt,
   ArrayPrototypeForEach,
   ArrayPrototypeIncludes,
-  DateNow,
+  DatePrototypeGetTime,
+  DatePrototypeToString,
   FunctionPrototypeApply,
   FunctionPrototypeBind,
+  FunctionPrototypeToString,
+  globalThis,
+  NumberIsNaN,
   ObjectDefineProperty,
+  ObjectDefineProperties,
   ObjectGetOwnPropertyDescriptor,
+  ObjectGetOwnPropertyDescriptors,
   Promise,
+  Symbol,
   SymbolAsyncIterator,
   SymbolDispose,
-  globalThis,
 } = primordials;
 const {
   validateAbortSignal,
   validateArray,
+  validateNumber,
 } = require('internal/validators');
 
 const {
   AbortError,
-  codes: {
-    ERR_INVALID_STATE,
-    ERR_INVALID_ARG_VALUE,
-  },
+  codes: { ERR_INVALID_STATE, ERR_INVALID_ARG_VALUE },
 } = require('internal/errors');
 
 const PriorityQueue = require('internal/priority_queue');
@@ -37,6 +41,10 @@ const nodeTimersPromises = require('timers/promises');
 const EventEmitter = require('events');
 
 let kResistStopPropagation;
+// Internal reference to the MockTimers class inside MockDate
+let kMock;
+// Initial epoch to which #now should be set to
+const kInitialEpoch = 0;
 
 function compareTimersLists(a, b) {
   return (a.runAt - b.runAt) || (a.id - b.id);
@@ -50,7 +58,10 @@ function abortIt(signal) {
   return new AbortError(undefined, { __proto__: null, cause: signal.reason });
 }
 
-const SUPPORTED_TIMERS = ['setTimeout', 'setInterval', 'setImmediate'];
+/**
+ * @enum {('setTimeout'|'setInterval'|'setImmediate'|'Date')[]} Supported timers
+ */
+const SUPPORTED_APIS = ['setTimeout', 'setInterval', 'setImmediate', 'Date'];
 const TIMERS_DEFAULT_INTERVAL = {
   __proto__: null,
   setImmediate: -1,
@@ -75,10 +86,12 @@ class MockTimers {
   #realTimersClearImmediate;
   #realPromisifiedSetImmediate;
 
+  #nativeDateDescriptor;
+
   #timersInContext = [];
   #isEnabled = false;
   #currentTimer = 1;
-  #now = DateNow();
+  #now = kInitialEpoch;
 
   #executionQueue = new PriorityQueue(compareTimersLists, setPosition);
 
@@ -86,21 +99,165 @@ class MockTimers {
   #clearTimeout = FunctionPrototypeBind(this.#clearTimer, this);
   #setInterval = FunctionPrototypeBind(this.#createTimer, this, true);
   #clearInterval = FunctionPrototypeBind(this.#clearTimer, this);
-
-  #setImmediate = (callback, ...args) => {
-    return this.#createTimer(
-      false,
-      callback,
-      TIMERS_DEFAULT_INTERVAL.setImmediate,
-      ...args,
-    );
-  };
-
   #clearImmediate = FunctionPrototypeBind(this.#clearTimer, this);
+
   constructor() {
     emitExperimentalWarning('The MockTimers API');
   }
 
+  #restoreSetImmediate() {
+    ObjectDefineProperty(
+      globalThis,
+      'setImmediate',
+      this.#realSetImmediate,
+    );
+    ObjectDefineProperty(
+      globalThis,
+      'clearImmediate',
+      this.#realClearImmediate,
+    );
+    ObjectDefineProperty(
+      nodeTimers,
+      'setImmediate',
+      this.#realTimersSetImmediate,
+    );
+    ObjectDefineProperty(
+      nodeTimers,
+      'clearImmediate',
+      this.#realTimersClearImmediate,
+    );
+    ObjectDefineProperty(
+      nodeTimersPromises,
+      'setImmediate',
+      this.#realPromisifiedSetImmediate,
+    );
+  }
+
+  #restoreOriginalSetInterval() {
+    ObjectDefineProperty(
+      globalThis,
+      'setInterval',
+      this.#realSetInterval,
+    );
+    ObjectDefineProperty(
+      globalThis,
+      'clearInterval',
+      this.#realClearInterval,
+    );
+    ObjectDefineProperty(
+      nodeTimers,
+      'setInterval',
+      this.#realTimersSetInterval,
+    );
+    ObjectDefineProperty(
+      nodeTimers,
+      'clearInterval',
+      this.#realTimersClearInterval,
+    );
+    ObjectDefineProperty(
+      nodeTimersPromises,
+      'setInterval',
+      this.#realPromisifiedSetInterval,
+    );
+  }
+
+  #restoreOriginalSetTimeout() {
+    ObjectDefineProperty(
+      globalThis,
+      'setTimeout',
+      this.#realSetTimeout,
+    );
+    ObjectDefineProperty(
+      globalThis,
+      'clearTimeout',
+      this.#realClearTimeout,
+    );
+    ObjectDefineProperty(
+      nodeTimers,
+      'setTimeout',
+      this.#realTimersSetTimeout,
+    );
+    ObjectDefineProperty(
+      nodeTimers,
+      'clearTimeout',
+      this.#realTimersClearTimeout,
+    );
+    ObjectDefineProperty(
+      nodeTimersPromises,
+      'setTimeout',
+      this.#realPromisifiedSetTimeout,
+    );
+  }
+
+  #storeOriginalSetImmediate() {
+    this.#realSetImmediate = ObjectGetOwnPropertyDescriptor(
+      globalThis,
+      'setImmediate',
+    );
+    this.#realClearImmediate = ObjectGetOwnPropertyDescriptor(
+      globalThis,
+      'clearImmediate',
+    );
+    this.#realTimersSetImmediate = ObjectGetOwnPropertyDescriptor(
+      nodeTimers,
+      'setImmediate',
+    );
+    this.#realTimersClearImmediate = ObjectGetOwnPropertyDescriptor(
+      nodeTimers,
+      'clearImmediate',
+    );
+    this.#realPromisifiedSetImmediate = ObjectGetOwnPropertyDescriptor(
+      nodeTimersPromises,
+      'setImmediate',
+    );
+  }
+
+  #storeOriginalSetInterval() {
+    this.#realSetInterval = ObjectGetOwnPropertyDescriptor(
+      globalThis,
+      'setInterval',
+    );
+    this.#realClearInterval = ObjectGetOwnPropertyDescriptor(
+      globalThis,
+      'clearInterval',
+    );
+    this.#realTimersSetInterval = ObjectGetOwnPropertyDescriptor(
+      nodeTimers,
+      'setInterval',
+    );
+    this.#realTimersClearInterval = ObjectGetOwnPropertyDescriptor(
+      nodeTimers,
+      'clearInterval',
+    );
+    this.#realPromisifiedSetInterval = ObjectGetOwnPropertyDescriptor(
+      nodeTimersPromises,
+      'setInterval',
+    );
+  }
+
+  #storeOriginalSetTimeout() {
+    this.#realSetTimeout = ObjectGetOwnPropertyDescriptor(
+      globalThis,
+      'setTimeout',
+    );
+    this.#realClearTimeout = ObjectGetOwnPropertyDescriptor(
+      globalThis,
+      'clearTimeout',
+    );
+    this.#realTimersSetTimeout = ObjectGetOwnPropertyDescriptor(
+      nodeTimers,
+      'setTimeout',
+    );
+    this.#realTimersClearTimeout = ObjectGetOwnPropertyDescriptor(
+      nodeTimers,
+      'clearTimeout',
+    );
+    this.#realPromisifiedSetTimeout = ObjectGetOwnPropertyDescriptor(
+      nodeTimersPromises,
+      'setTimeout',
+    );
+  }
+
   #createTimer(isInterval, callback, delay, ...args) {
     const timerId = this.#currentTimer++;
     this.#executionQueue.insert({
@@ -119,6 +276,100 @@ class MockTimers {
     this.#executionQueue.removeAt(position);
   }
 
+  #createDate() {
+    kMock ??= Symbol('MockTimers');
+    const NativeDateConstructor = this.#nativeDateDescriptor.value;
+    /**
+     * Function to mock the Date constructor, treats cases as per ECMA-262
+     * and returns a Date object with a mocked implementation
+     * @typedef {Date} MockDate
+     * @returns {MockDate} a mocked Date object
+     */
+    function MockDate(year, month, date, hours, minutes, seconds, ms) {
+      const mockTimersSource = MockDate[kMock];
+      const nativeDate = mockTimersSource.#nativeDateDescriptor.value;
+
+      // As of the fake-timers implementation for Sinon
+      // ref https://github.com/sinonjs/fake-timers/blob/a4c757f80840829e45e0852ea1b17d87a998388e/src/fake-timers-src.js#L456
+      // This covers the Date constructor called as a function ref.
+      // ECMA-262 Edition 5.1 section 15.9.2.
+      // and ECMA-262 Edition 14 Section 21.4.2.1
+      // replaces 'this instanceof MockDate' with a more reliable check
+      // from ECMA-262 Edition 14 Section 13.3.12.1 NewTarget
+      if (!new.target) {
+        return DatePrototypeToString(new nativeDate(mockTimersSource.#now));
+      }
+
+      // Cases where Date is called as a constructor
+      // This is intended as a defensive implementation to avoid
+      // having unexpected returns
+      switch (arguments.length) {
+        case 0:
+          return new nativeDate(MockDate[kMock].#now);
+        case 1:
+          return new nativeDate(year);
+        case 2:
+          return new nativeDate(year, month);
+        case 3:
+          return new nativeDate(year, month, date);
+        case 4:
+          return new nativeDate(year, month, date, hours);
+        case 5:
+          return new nativeDate(year, month, date, hours, minutes);
+        case 6:
+          return new nativeDate(year, month, date, hours, minutes, seconds);
+        default:
+          return new nativeDate(year, month, date, hours, minutes, seconds, ms);
+      }
+    }
+
+    // Prototype is read-only, and non assignable through Object.defineProperties
+    // eslint-disable-next-line no-unused-vars -- used to get the prototype out of the object
+    const { prototype, ...dateProps } = ObjectGetOwnPropertyDescriptors(NativeDateConstructor);
+
+    // Binds all the properties of Date to the MockDate function
+    ObjectDefineProperties(
+      MockDate,
+      dateProps,
+    );
+
+    MockDate.now = function now() {
+      return MockDate[kMock].#now;
+    };
+
+    // This is just to print the function { native code } in the console
+    // when the user prints the function and not the internal code
+    MockDate.toString = function toString() {
+      return FunctionPrototypeToString(MockDate[kMock].#nativeDateDescriptor.value);
+    };
+
+    // We need to polute the prototype of this
+    ObjectDefineProperties(MockDate, {
+      __proto__: null,
+      [kMock]: {
+        __proto__: null,
+        enumerable: false,
+        configurable: false,
+        writable: false,
+        value: this,
+      },
+
+      isMock: {
+        __proto__: null,
+        enumerable: true,
+        configurable: false,
+        writable: false,
+        value: true,
+      },
+    });
+
+    MockDate.prototype = NativeDateConstructor.prototype;
+    MockDate.parse = NativeDateConstructor.parse;
+    MockDate.UTC = NativeDateConstructor.UTC;
+    MockDate.prototype.toUTCString = NativeDateConstructor.prototype.toUTCString;
+    return MockDate;
+  }
+
   async * #setIntervalPromisified(interval, startTime, options) {
     const context = this;
     const emitter = new EventEmitter();
@@ -179,6 +430,15 @@ class MockTimers {
     yield* iterator;
   }
 
+  #setImmediate(callback, ...args) {
+    return this.#createTimer(
+      false,
+      callback,
+      TIMERS_DEFAULT_INTERVAL.setImmediate,
+      ...args,
+    );
+  }
+
   #promisifyTimer({ timerFn, clearFn, ms, result, options }) {
     return new Promise((resolve, reject) => {
       if (options?.signal) {
@@ -235,6 +495,30 @@ class MockTimers {
     });
   }
 
+  #assertTimersAreEnabled() {
+    if (!this.#isEnabled) {
+      throw new ERR_INVALID_STATE(
+        'You should enable MockTimers first by calling the .enable function',
+      );
+    }
+  }
+
+  #assertTimeArg(time) {
+    if (time < 0) {
+      throw new ERR_INVALID_ARG_VALUE('time', 'positive integer', time);
+    }
+  }
+
+  #isValidDateWithGetTime(maybeDate) {
+    // Validation inspired on https://github.com/inspect-js/is-date-object/blob/main/index.js#L3-L11
+    try {
+      DatePrototypeGetTime(maybeDate);
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
   #toggleEnableTimers(activate) {
     const options = {
       __proto__: null,
@@ -271,17 +555,31 @@ class MockTimers {
         setImmediate: () => {
           this.#storeOriginalSetImmediate();
 
-          globalThis.setImmediate = this.#setImmediate;
+          // setImmediate functions needs to bind MockTimers
+          // otherwise it will throw an error when called
+          // "Receiver must be an instance of MockTimers"
+          // because #setImmediate is the only function here
+          // that calls #createTimer and it's not bound to MockTimers
+          globalThis.setImmediate = FunctionPrototypeBind(
+            this.#setImmediate,
+            this,
+          );
           globalThis.clearImmediate = this.#clearImmediate;
 
-          nodeTimers.setImmediate = this.#setImmediate;
+          nodeTimers.setImmediate = FunctionPrototypeBind(
+            this.#setImmediate,
+            this,
+          );
           nodeTimers.clearImmediate = this.#clearImmediate;
-
           nodeTimersPromises.setImmediate = FunctionPrototypeBind(
             this.#setImmediatePromisified,
             this,
           );
         },
+        Date: () => {
+          this.#nativeDateDescriptor = ObjectGetOwnPropertyDescriptor(globalThis, 'Date');
+          globalThis.Date = this.#createDate();
+        },
       },
       toReal: {
         __proto__: null,
@@ -294,6 +592,9 @@ class MockTimers {
         setImmediate: () => {
           this.#restoreSetImmediate();
         },
+        Date: () => {
+          ObjectDefineProperty(globalThis, 'Date', this.#nativeDateDescriptor);
+        },
       },
     };
 
@@ -302,159 +603,6 @@ class MockTimers {
     this.#isEnabled = activate;
   }
 
-  #restoreSetImmediate() {
-    ObjectDefineProperty(
-      globalThis,
-      'setImmediate',
-      this.#realSetImmediate,
-    );
-    ObjectDefineProperty(
-      globalThis,
-      'clearImmediate',
-      this.#realClearImmediate,
-    );
-    ObjectDefineProperty(
-      nodeTimers,
-      'setImmediate',
-      this.#realTimersSetImmediate,
-    );
-    ObjectDefineProperty(
-      nodeTimers,
-      'clearImmediate',
-      this.#realTimersClearImmediate,
-    );
-    ObjectDefineProperty(
-      nodeTimersPromises,
-      'setImmediate',
-      this.#realPromisifiedSetImmediate,
-    );
-  }
-
-  #restoreOriginalSetInterval() {
-    ObjectDefineProperty(
-      globalThis,
-      'setInterval',
-      this.#realSetInterval,
-    );
-    ObjectDefineProperty(
-      globalThis,
-      'clearInterval',
-      this.#realClearInterval,
-    );
-    ObjectDefineProperty(
-      nodeTimers,
-      'setInterval',
-      this.#realTimersSetInterval,
-    );
-    ObjectDefineProperty(
-      nodeTimers,
-      'clearInterval',
-      this.#realTimersClearInterval,
-    );
-    ObjectDefineProperty(
-      nodeTimersPromises,
-      'setInterval',
-      this.#realPromisifiedSetInterval,
-    );
-  }
-
-  #restoreOriginalSetTimeout() {
-    ObjectDefineProperty(
-      globalThis,
-      'setTimeout',
-      this.#realSetTimeout,
-    );
-    ObjectDefineProperty(
-      globalThis,
-      'clearTimeout',
-      this.#realClearTimeout,
-    );
-    ObjectDefineProperty(
-      nodeTimers,
-      'setTimeout',
-      this.#realTimersSetTimeout,
-    );
-    ObjectDefineProperty(
-      nodeTimers,
-      'clearTimeout',
-      this.#realTimersClearTimeout,
-    );
-    ObjectDefineProperty(
-      nodeTimersPromises,
-      'setTimeout',
-      this.#realPromisifiedSetTimeout,
-    );
-  }
-
-  #storeOriginalSetImmediate() {
-    this.#realSetImmediate = ObjectGetOwnPropertyDescriptor(
-      globalThis,
-      'setImmediate',
-    );
-    this.#realClearImmediate = ObjectGetOwnPropertyDescriptor(
-      globalThis,
-      'clearImmediate',
-    );
-    this.#realTimersSetImmediate = ObjectGetOwnPropertyDescriptor(
-      nodeTimers,
-      'setImmediate',
-    );
-    this.#realTimersClearImmediate = ObjectGetOwnPropertyDescriptor(
-      nodeTimers,
-      'clearImmediate',
-    );
-    this.#realPromisifiedSetImmediate = ObjectGetOwnPropertyDescriptor(
-      nodeTimersPromises,
-      'setImmediate',
-    );
-  }
-
-  #storeOriginalSetInterval() {
-    this.#realSetInterval = ObjectGetOwnPropertyDescriptor(
-      globalThis,
-      'setInterval',
-    );
-    this.#realClearInterval = ObjectGetOwnPropertyDescriptor(
-      globalThis,
-      'clearInterval',
-    );
-    this.#realTimersSetInterval = ObjectGetOwnPropertyDescriptor(
-      nodeTimers,
-      'setInterval',
-    );
-    this.#realTimersClearInterval = ObjectGetOwnPropertyDescriptor(
-      nodeTimers,
-      'clearInterval',
-    );
-    this.#realPromisifiedSetInterval = ObjectGetOwnPropertyDescriptor(
-      nodeTimersPromises,
-      'setInterval',
-    );
-  }
-
-  #storeOriginalSetTimeout() {
-    this.#realSetTimeout = ObjectGetOwnPropertyDescriptor(
-      globalThis,
-      'setTimeout',
-    );
-    this.#realClearTimeout = ObjectGetOwnPropertyDescriptor(
-      globalThis,
-      'clearTimeout',
-    );
-    this.#realTimersSetTimeout = ObjectGetOwnPropertyDescriptor(
-      nodeTimers,
-      'setTimeout',
-    );
-    this.#realTimersClearTimeout = ObjectGetOwnPropertyDescriptor(
-      nodeTimers,
-      'clearTimeout',
-    );
-    this.#realPromisifiedSetTimeout = ObjectGetOwnPropertyDescriptor(
-      nodeTimersPromises,
-      'setTimeout',
-    );
-  }
-
   /**
    * Advances the virtual time of MockTimers by the specified duration (in milliseconds).
    * This method simulates the passage of time and triggers any scheduled timers that are due.
@@ -463,19 +611,8 @@ class MockTimers {
    * @throws {ERR_INVALID_ARG_VALUE} If a negative time value is provided.
    */
   tick(time = 1) {
-    if (!this.#isEnabled) {
-      throw new ERR_INVALID_STATE(
-        'You should enable MockTimers first by calling the .enable function',
-      );
-    }
-
-    if (time < 0) {
-      throw new ERR_INVALID_ARG_VALUE(
-        'time',
-        'positive integer',
-        time,
-      );
-    }
+    this.#assertTimersAreEnabled();
+    this.#assertTimeArg(time);
 
     this.#now += time;
     let timer = this.#executionQueue.peek();
@@ -496,36 +633,68 @@ class MockTimers {
   }
 
   /**
-   * Enables MockTimers for the specified timers.
-   * @param {string[]} timers - An array of timer types to enable, e.g., ['setTimeout', 'setInterval'].
-   * @throws {ERR_INVALID_STATE} If MockTimers are already enabled.
-   * @throws {ERR_INVALID_ARG_VALUE} If an unsupported timer type is specified.
+   * @typedef {{apis: SUPPORTED_APIS;now: number | Date;}} EnableOptions Options to enable the timers
+   * @property {SUPPORTED_APIS} apis List of timers to enable, defaults to all
+   * @property {number | Date} now The epoch to which the timers should be set to, defaults to 0
    */
-  enable(timers = SUPPORTED_TIMERS) {
+  /**
+   * Enables the MockTimers replacing the native timers with the fake ones.
+   * @param {EnableOptions} options
+   */
+  enable(options = { __proto__: null, apis: SUPPORTED_APIS, now: 0 }) {
+    const internalOptions = { __proto__: null, ...options };
     if (this.#isEnabled) {
-      throw new ERR_INVALID_STATE(
-        'MockTimers is already enabled!',
-      );
+      throw new ERR_INVALID_STATE('MockTimers is already enabled!');
+    }
+
+    if (NumberIsNaN(internalOptions.now)) {
+      throw new ERR_INVALID_ARG_VALUE('now', internalOptions.now, `epoch must be a positive integer received ${internalOptions.now}`);
     }
 
-    validateArray(timers, 'timers');
+    if (!internalOptions.now) {
+      internalOptions.now = 0;
+    }
+
+    if (!internalOptions.apis) {
+      internalOptions.apis = SUPPORTED_APIS;
+    }
 
+    validateArray(internalOptions.apis, 'options.apis');
     // Check that the timers passed are supported
-    ArrayPrototypeForEach(timers, (timer) => {
-      if (!ArrayPrototypeIncludes(SUPPORTED_TIMERS, timer)) {
+    ArrayPrototypeForEach(internalOptions.apis, (timer) => {
+      if (!ArrayPrototypeIncludes(SUPPORTED_APIS, timer)) {
         throw new ERR_INVALID_ARG_VALUE(
-          'timers',
+          'options.apis',
           timer,
           `option ${timer} is not supported`,
         );
       }
     });
+    this.#timersInContext = internalOptions.apis;
+
+    // Checks if the second argument is the initial time
+    if (this.#isValidDateWithGetTime(internalOptions.now)) {
+      this.#now = DatePrototypeGetTime(internalOptions.now);
+    } else if (validateNumber(internalOptions.now, 'initialTime') === undefined) {
+      this.#assertTimeArg(internalOptions.now);
+      this.#now = internalOptions.now;
+    }
 
-    this.#timersInContext = timers;
-    this.#now = DateNow();
     this.#toggleEnableTimers(true);
   }
 
+  /**
+   * Sets the current time to the given epoch.
+   * @param {number} time The epoch to set the current time to.
+   */
+  setTime(time = kInitialEpoch) {
+    validateNumber(time, 'time');
+    this.#assertTimeArg(time);
+    this.#assertTimersAreEnabled();
+
+    this.#now = time;
+  }
+
   /**
    * An alias for `this.reset()`, allowing the disposal of the `MockTimers` instance.
    */
@@ -543,6 +712,7 @@ class MockTimers {
 
     this.#toggleEnableTimers(false);
     this.#timersInContext = [];
+    this.#now = kInitialEpoch;
 
     let timer = this.#executionQueue.peek();
     while (timer) {
@@ -556,13 +726,10 @@ class MockTimers {
    * @throws {ERR_INVALID_STATE} If MockTimers are not enabled.
    */
   runAll() {
-    if (!this.#isEnabled) {
-      throw new ERR_INVALID_STATE(
-        'You should enable MockTimers first by calling the .enable function',
-      );
-    }
-
-    this.tick(Infinity);
+    this.#assertTimersAreEnabled();
+    const longestTimer = this.#executionQueue.peekBottom();
+    if (!longestTimer) return;
+    this.tick(longestTimer.runAt - this.#now);
   }
 }
 
diff --git a/test/parallel/test-runner-mock-timers.js b/test/parallel/test-runner-mock-timers.js
index 3a2203091337c6..088002b93867ef 100644
--- a/test/parallel/test-runner-mock-timers.js
+++ b/test/parallel/test-runner-mock-timers.js
@@ -11,7 +11,7 @@ describe('Mock Timers Test Suite', () => {
   describe('MockTimers API', () => {
     it('should throw an error if trying to enable a timer that is not supported', (t) => {
       assert.throws(() => {
-        t.mock.timers.enable(['DOES_NOT_EXIST']);
+        t.mock.timers.enable({ apis: ['DOES_NOT_EXIST'] });
       }, {
         code: 'ERR_INVALID_ARG_VALUE',
       });
@@ -46,6 +46,7 @@ describe('Mock Timers Test Suite', () => {
         code: 'ERR_INVALID_ARG_VALUE',
       });
     });
+
     it('should check that propertyDescriptor gets back after resetting timers', (t) => {
       const getDescriptor = (ctx, fn) => Object.getOwnPropertyDescriptor(ctx, fn);
       const getCurrentTimersDescriptors = () => {
@@ -107,6 +108,7 @@ describe('Mock Timers Test Suite', () => {
       const fn = t.mock.fn();
       global.setTimeout(fn, 1000);
       t.mock.timers.reset();
+      assert.deepStrictEqual(Date.now, globalThis.Date.now);
       assert.throws(() => {
         t.mock.timers.tick(1000);
       }, {
@@ -166,14 +168,34 @@ describe('Mock Timers Test Suite', () => {
         assert.strictEqual(timeoutFn.mock.callCount(), 1);
         assert.strictEqual(intervalFn.mock.callCount(), 1);
       });
-    });
 
+      it('should increase the epoch as the tick run for runAll', async (t) => {
+        const timeoutFn = t.mock.fn();
+        const intervalFn = t.mock.fn();
+
+        t.mock.timers.enable();
+        global.setTimeout(timeoutFn, 1111);
+        const id = global.setInterval(intervalFn, 9999);
+        t.mock.timers.runAll();
+
+        global.clearInterval(id);
+        assert.strictEqual(timeoutFn.mock.callCount(), 1);
+        assert.strictEqual(intervalFn.mock.callCount(), 1);
+        assert.strictEqual(Date.now(), 9999);
+      });
+
+      it('should not error if there are not timers to run', (t) => {
+        t.mock.timers.enable();
+        t.mock.timers.runAll();
+        // Should not throw
+      });
+    });
   });
 
   describe('globals/timers', () => {
     describe('setTimeout Suite', () => {
       it('should advance in time and trigger timers when calling the .tick function', (t) => {
-        mock.timers.enable(['setTimeout']);
+        mock.timers.enable({ apis: ['setTimeout'] });
 
         const fn = mock.fn();
 
@@ -185,7 +207,7 @@ describe('Mock Timers Test Suite', () => {
       });
 
       it('should advance in time and trigger timers when calling the .tick function multiple times', (t) => {
-        t.mock.timers.enable(['setTimeout']);
+        t.mock.timers.enable({ apis: ['setTimeout'] });
         const fn = t.mock.fn();
 
         global.setTimeout(fn, 2000);
@@ -199,7 +221,7 @@ describe('Mock Timers Test Suite', () => {
       });
 
       it('should work with the same params as the original setTimeout', (t) => {
-        t.mock.timers.enable(['setTimeout']);
+        t.mock.timers.enable({ apis: ['setTimeout'] });
         const fn = t.mock.fn();
         const args = ['a', 'b', 'c'];
         global.setTimeout(fn, 2000, ...args);
@@ -221,12 +243,11 @@ describe('Mock Timers Test Suite', () => {
           done();
         }), timeout);
       });
-
     });
 
     describe('clearTimeout Suite', () => {
       it('should not advance in time if clearTimeout was invoked', (t) => {
-        t.mock.timers.enable(['setTimeout']);
+        t.mock.timers.enable({ apis: ['setTimeout'] });
 
         const fn = mock.fn();
 
@@ -240,7 +261,7 @@ describe('Mock Timers Test Suite', () => {
 
     describe('setInterval Suite', () => {
       it('should tick three times using fake setInterval', (t) => {
-        t.mock.timers.enable(['setInterval']);
+        t.mock.timers.enable({ apis: ['setInterval'] });
         const fn = t.mock.fn();
 
         const id = global.setInterval(fn, 200);
@@ -255,7 +276,7 @@ describe('Mock Timers Test Suite', () => {
       });
 
       it('should work with the same params as the original setInterval', (t) => {
-        t.mock.timers.enable(['setInterval']);
+        t.mock.timers.enable({ apis: ['setInterval'] });
         const fn = t.mock.fn();
         const args = ['a', 'b', 'c'];
         const id = global.setInterval(fn, 200, ...args);
@@ -270,13 +291,12 @@ describe('Mock Timers Test Suite', () => {
         assert.deepStrictEqual(fn.mock.calls[0].arguments, args);
         assert.deepStrictEqual(fn.mock.calls[1].arguments, args);
         assert.deepStrictEqual(fn.mock.calls[2].arguments, args);
-
       });
     });
 
     describe('clearInterval Suite', () => {
       it('should not advance in time if clearInterval was invoked', (t) => {
-        t.mock.timers.enable(['setInterval']);
+        t.mock.timers.enable({ apis: ['setInterval'] });
 
         const fn = mock.fn();
         const id = global.setInterval(fn, 200);
@@ -299,7 +319,7 @@ describe('Mock Timers Test Suite', () => {
       });
 
       it('should work with the same params as the original setImmediate', (t) => {
-        t.mock.timers.enable(['setImmediate']);
+        t.mock.timers.enable({ apis: ['setImmediate'] });
         const fn = t.mock.fn();
         const args = ['a', 'b', 'c'];
         global.setImmediate(fn, ...args);
@@ -310,7 +330,7 @@ describe('Mock Timers Test Suite', () => {
       });
 
       it('should not advance in time if clearImmediate was invoked', (t) => {
-        t.mock.timers.enable(['setImmediate']);
+        t.mock.timers.enable({ apis: ['setImmediate'] });
 
         const id = global.setImmediate(common.mustNotCall());
         global.clearImmediate(id);
@@ -318,13 +338,13 @@ describe('Mock Timers Test Suite', () => {
       });
 
       it('should advance in time and trigger timers when calling the .tick function', (t) => {
-        t.mock.timers.enable(['setImmediate']);
+        t.mock.timers.enable({ apis: ['setImmediate'] });
         global.setImmediate(common.mustCall(1));
         t.mock.timers.tick(0);
       });
 
       it('should execute in order if setImmediate is called multiple times', (t) => {
-        t.mock.timers.enable(['setImmediate']);
+        t.mock.timers.enable({ apis: ['setImmediate'] });
         const order = [];
         const fn1 = t.mock.fn(common.mustCall(() => order.push('f1'), 1));
         const fn2 = t.mock.fn(common.mustCall(() => order.push('f2'), 1));
@@ -338,7 +358,7 @@ describe('Mock Timers Test Suite', () => {
       });
 
       it('should execute setImmediate first if setTimeout was also called', (t) => {
-        t.mock.timers.enable(['setImmediate', 'setTimeout']);
+        t.mock.timers.enable({ apis: ['setImmediate', 'setTimeout'] });
         const order = [];
         const fn1 = t.mock.fn(common.mustCall(() => order.push('f1'), 1));
         const fn2 = t.mock.fn(common.mustCall(() => order.push('f2'), 1));
@@ -351,524 +371,357 @@ describe('Mock Timers Test Suite', () => {
         assert.deepStrictEqual(order, ['f1', 'f2']);
       });
     });
-  });
-
-  describe('timers Suite', () => {
-    describe('setTimeout Suite', () => {
-      it('should advance in time and trigger timers when calling the .tick function multiple times', (t) => {
-        t.mock.timers.enable(['setTimeout']);
-        const fn = t.mock.fn();
-        const { setTimeout } = nodeTimers;
-        setTimeout(fn, 2000);
-
-        t.mock.timers.tick(1000);
-        t.mock.timers.tick(500);
-        t.mock.timers.tick(500);
-
-        assert.strictEqual(fn.mock.callCount(), 1);
-      });
-
-      it('should work with the same params as the original timers.setTimeout', (t) => {
-        t.mock.timers.enable(['setTimeout']);
-        const fn = t.mock.fn();
-        const { setTimeout } = nodeTimers;
-        const args = ['a', 'b', 'c'];
-        setTimeout(fn, 2000, ...args);
-
-        t.mock.timers.tick(1000);
-        t.mock.timers.tick(500);
-        t.mock.timers.tick(500);
-
-        assert.strictEqual(fn.mock.callCount(), 1);
-        assert.deepStrictEqual(fn.mock.calls[0].arguments, args);
-      });
-    });
-
-    describe('clearTimeout Suite', () => {
-      it('should not advance in time if clearTimeout was invoked', (t) => {
-        t.mock.timers.enable(['setTimeout']);
-
-        const fn = mock.fn();
-        const { setTimeout, clearTimeout } = nodeTimers;
-        const id = setTimeout(fn, 2000);
-        clearTimeout(id);
-        t.mock.timers.tick(2000);
-
-        assert.strictEqual(fn.mock.callCount(), 0);
-      });
-    });
-
-    describe('setInterval Suite', () => {
-      it('should tick three times using fake setInterval', (t) => {
-        t.mock.timers.enable(['setInterval']);
-        const fn = t.mock.fn();
-
-        const id = nodeTimers.setInterval(fn, 200);
-
-        t.mock.timers.tick(200);
-        t.mock.timers.tick(200);
-        t.mock.timers.tick(200);
-        t.mock.timers.tick(200);
-
-        nodeTimers.clearInterval(id);
-
-        assert.strictEqual(fn.mock.callCount(), 4);
-      });
-
-      it('should work with the same params as the original timers.setInterval', (t) => {
-        t.mock.timers.enable(['setInterval']);
-        const fn = t.mock.fn();
-        const args = ['a', 'b', 'c'];
-        const id = nodeTimers.setInterval(fn, 200, ...args);
-
-        t.mock.timers.tick(200);
-        t.mock.timers.tick(200);
-        t.mock.timers.tick(200);
-        t.mock.timers.tick(200);
-
-        nodeTimers.clearInterval(id);
-
-        assert.strictEqual(fn.mock.callCount(), 4);
-        assert.deepStrictEqual(fn.mock.calls[0].arguments, args);
-        assert.deepStrictEqual(fn.mock.calls[1].arguments, args);
-        assert.deepStrictEqual(fn.mock.calls[2].arguments, args);
-        assert.deepStrictEqual(fn.mock.calls[3].arguments, args);
-
-      });
-    });
 
-    describe('clearInterval Suite', () => {
-      it('should not advance in time if clearInterval was invoked', (t) => {
-        t.mock.timers.enable(['setInterval']);
+    describe('timers/promises', () => {
+      describe('setTimeout Suite', () => {
+        it('should advance in time and trigger timers when calling the .tick function multiple times', async (t) => {
+          t.mock.timers.enable({ apis: ['setTimeout'] });
 
-        const fn = mock.fn();
-        const { setInterval, clearInterval } = nodeTimers;
-        const id = setInterval(fn, 200);
-        clearInterval(id);
-        t.mock.timers.tick(200);
+          const p = nodeTimersPromises.setTimeout(2000);
 
-        assert.strictEqual(fn.mock.callCount(), 0);
-      });
-    });
+          t.mock.timers.tick(1000);
+          t.mock.timers.tick(500);
+          t.mock.timers.tick(500);
+          t.mock.timers.tick(500);
 
-    describe('setImmediate Suite', () => {
-      it('should keep setImmediate working if timers are disabled', (t, done) => {
-        const now = Date.now();
-        const timeout = 2;
-        const expected = () => now - timeout;
-        nodeTimers.setImmediate(common.mustCall(() => {
-          assert.strictEqual(now - timeout, expected());
-          done();
-        }, 1));
-      });
-
-      it('should work with the same params as the original setImmediate', (t) => {
-        t.mock.timers.enable(['setImmediate']);
-        const fn = t.mock.fn();
-        const args = ['a', 'b', 'c'];
-        nodeTimers.setImmediate(fn, ...args);
-        t.mock.timers.tick(9999);
-
-        assert.strictEqual(fn.mock.callCount(), 1);
-        assert.deepStrictEqual(fn.mock.calls[0].arguments, args);
-      });
-
-      it('should not advance in time if clearImmediate was invoked', (t) => {
-        t.mock.timers.enable(['setImmediate']);
-
-        const id = nodeTimers.setImmediate(common.mustNotCall());
-        nodeTimers.clearImmediate(id);
-        t.mock.timers.tick(200);
-      });
-
-      it('should advance in time and trigger timers when calling the .tick function', (t) => {
-        t.mock.timers.enable(['setImmediate']);
-        nodeTimers.setImmediate(common.mustCall(1));
-        t.mock.timers.tick(0);
-      });
-
-      it('should execute in order if setImmediate is called multiple times', (t) => {
-        t.mock.timers.enable(['setImmediate']);
-        const order = [];
-        const fn1 = t.mock.fn(common.mustCall(() => order.push('f1'), 1));
-        const fn2 = t.mock.fn(common.mustCall(() => order.push('f2'), 1));
-
-        nodeTimers.setImmediate(fn1);
-        nodeTimers.setImmediate(fn2);
-
-        t.mock.timers.tick(0);
-
-        assert.deepStrictEqual(order, ['f1', 'f2']);
-      });
-
-      it('should execute setImmediate first if setTimeout was also called', (t) => {
-        t.mock.timers.enable(['setImmediate', 'setTimeout']);
-        const order = [];
-        const fn1 = t.mock.fn(common.mustCall(() => order.push('f1'), 1));
-        const fn2 = t.mock.fn(common.mustCall(() => order.push('f2'), 1));
-
-        nodeTimers.setTimeout(fn2, 0);
-        nodeTimers.setImmediate(fn1);
-
-        t.mock.timers.tick(100);
-
-        assert.deepStrictEqual(order, ['f1', 'f2']);
-      });
-    });
-  });
-
-  describe('timers/promises', () => {
-    describe('setTimeout Suite', () => {
-      it('should advance in time and trigger timers when calling the .tick function multiple times', async (t) => {
-        t.mock.timers.enable(['setTimeout']);
-
-        const p = nodeTimersPromises.setTimeout(2000);
-
-        t.mock.timers.tick(1000);
-        t.mock.timers.tick(500);
-        t.mock.timers.tick(500);
-        t.mock.timers.tick(500);
-
-        p.then(common.mustCall((result) => {
-          assert.strictEqual(result, undefined);
-        }));
-      });
-
-      it('should work with the same params as the original timers/promises/setTimeout', async (t) => {
-        t.mock.timers.enable(['setTimeout']);
-        const expectedResult = 'result';
-        const controller = new AbortController();
-        const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
-          ref: true,
-          signal: controller.signal
+          p.then(common.mustCall((result) => {
+            assert.strictEqual(result, undefined);
+          }));
         });
 
-        t.mock.timers.tick(1000);
-        t.mock.timers.tick(500);
-        t.mock.timers.tick(500);
-        t.mock.timers.tick(500);
-
-        const result = await p;
-        assert.strictEqual(result, expectedResult);
-      });
-
-      it('should abort operation if timers/promises/setTimeout received an aborted signal', async (t) => {
-        t.mock.timers.enable(['setTimeout']);
-        const expectedResult = 'result';
-        const controller = new AbortController();
-        const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
-          ref: true,
-          signal: controller.signal
-        });
-
-        t.mock.timers.tick(1000);
-        controller.abort();
-        t.mock.timers.tick(500);
-        t.mock.timers.tick(500);
-        t.mock.timers.tick(500);
-        await assert.rejects(() => p, {
-          name: 'AbortError',
+        it('should work with the same params as the original timers/promises/setTimeout', async (t) => {
+          t.mock.timers.enable({ apis: ['setTimeout'] });
+          const expectedResult = 'result';
+          const controller = new AbortController();
+          const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
+            ref: true,
+            signal: controller.signal,
+          });
+
+          t.mock.timers.tick(1000);
+          t.mock.timers.tick(500);
+          t.mock.timers.tick(500);
+          t.mock.timers.tick(500);
+
+          const result = await p;
+          assert.strictEqual(result, expectedResult);
         });
 
-      });
-      it('should abort operation even if the .tick wasn\'t called', async (t) => {
-        t.mock.timers.enable(['setTimeout']);
-        const expectedResult = 'result';
-        const controller = new AbortController();
-        const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
-          ref: true,
-          signal: controller.signal
+        it('should abort operation if timers/promises/setTimeout received an aborted signal', async (t) => {
+          t.mock.timers.enable({ apis: ['setTimeout'] });
+          const expectedResult = 'result';
+          const controller = new AbortController();
+          const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
+            ref: true,
+            signal: controller.signal,
+          });
+
+          t.mock.timers.tick(1000);
+          controller.abort();
+          t.mock.timers.tick(500);
+          t.mock.timers.tick(500);
+          t.mock.timers.tick(500);
+          await assert.rejects(() => p, {
+            name: 'AbortError',
+          });
         });
-
-        controller.abort();
-
-        await assert.rejects(() => p, {
-          name: 'AbortError',
+        it('should abort operation even if the .tick was not called', async (t) => {
+          t.mock.timers.enable({ apis: ['setTimeout'] });
+          const expectedResult = 'result';
+          const controller = new AbortController();
+          const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
+            ref: true,
+            signal: controller.signal,
+          });
+
+          controller.abort();
+
+          await assert.rejects(() => p, {
+            name: 'AbortError',
+          });
         });
 
-      });
-
-      it('should abort operation when .abort is called before calling setTimeout', async (t) => {
-        t.mock.timers.enable(['setTimeout']);
-        const expectedResult = 'result';
-        const controller = new AbortController();
-        controller.abort();
-        const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
-          ref: true,
-          signal: controller.signal
+        it('should abort operation when .abort is called before calling setInterval', async (t) => {
+          t.mock.timers.enable({ apis: ['setTimeout'] });
+          const expectedResult = 'result';
+          const controller = new AbortController();
+          controller.abort();
+          const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
+            ref: true,
+            signal: controller.signal,
+          });
+
+          await assert.rejects(() => p, {
+            name: 'AbortError',
+          });
         });
 
-        await assert.rejects(() => p, {
-          name: 'AbortError',
+        it('should reject given an an invalid signal instance', async (t) => {
+          t.mock.timers.enable({ apis: ['setTimeout'] });
+          const expectedResult = 'result';
+          const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
+            ref: true,
+            signal: {},
+          });
+
+          await assert.rejects(() => p, {
+            name: 'TypeError',
+            code: 'ERR_INVALID_ARG_TYPE',
+          });
         });
-
       });
 
-      it('should reject given an an invalid signal instance', async (t) => {
-        t.mock.timers.enable(['setTimeout']);
-        const expectedResult = 'result';
-        const p = nodeTimersPromises.setTimeout(2000, expectedResult, {
-          ref: true,
-          signal: {}
-        });
+      describe('setInterval Suite', () => {
+        it('should tick three times using fake setInterval', async (t) => {
+          t.mock.timers.enable({ apis: ['setInterval'] });
 
-        await assert.rejects(() => p, {
-          name: 'TypeError',
-          code: 'ERR_INVALID_ARG_TYPE'
-        });
+          const interval = 100;
+          const intervalIterator = nodeTimersPromises.setInterval(interval, Date.now());
 
-      });
-    });
-
-    describe('setInterval Suite', () => {
-      it('should tick three times using fake setInterval', async (t) => {
-        t.mock.timers.enable(['setInterval']);
-
-        const interval = 100;
-        const intervalIterator = nodeTimersPromises.setInterval(interval, Date.now());
+          const first = intervalIterator.next();
+          const second = intervalIterator.next();
+          const third = intervalIterator.next();
 
-        const first = intervalIterator.next();
-        const second = intervalIterator.next();
-        const third = intervalIterator.next();
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
 
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
+          const results = await Promise.all([
+            first,
+            second,
+            third,
+          ]);
 
-        const results = await Promise.all([
-          first,
-          second,
-          third,
-        ]);
-
-        const finished = await intervalIterator.return();
-        assert.deepStrictEqual(finished, { done: true, value: undefined });
-
-        results.forEach((result) => {
-          assert.strictEqual(typeof result.value, 'number');
-          assert.strictEqual(result.done, false);
+          const finished = await intervalIterator.return();
+          assert.deepStrictEqual(finished, { done: true, value: undefined });
+          results.forEach((result) => {
+            assert.strictEqual(typeof result.value, 'number');
+            assert.strictEqual(result.done, false);
+          });
         });
-
-      });
-      it('should tick five times testing a real use case', async (t) => {
-
-        t.mock.timers.enable(['setInterval']);
-
-        const expectedIterations = 5;
-        const interval = 1000;
-        const startedAt = Date.now();
-        async function run() {
-          const times = [];
-          for await (const time of nodeTimersPromises.setInterval(interval, startedAt)) {
-            times.push(time);
-            if (times.length === expectedIterations) break;
-
+        it('should tick five times testing a real use case', async (t) => {
+          t.mock.timers.enable({ apis: ['setInterval'] });
+
+          const expectedIterations = 5;
+          const interval = 1000;
+          const startedAt = Date.now();
+          async function run() {
+            const times = [];
+            for await (const time of nodeTimersPromises.setInterval(interval, startedAt)) {
+              times.push(time);
+              if (times.length === expectedIterations) break;
+            }
+            return times;
           }
-          return times;
-        }
 
-        const r = run();
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-
-        const timeResults = await r;
-        assert.strictEqual(timeResults.length, expectedIterations);
-        for (let it = 1; it < expectedIterations; it++) {
-          assert.strictEqual(timeResults[it - 1], startedAt + (interval * it));
-        }
-      });
+          const r = run();
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+
+          const timeResults = await r;
+          assert.strictEqual(timeResults.length, expectedIterations);
+          for (let it = 1; it < expectedIterations; it++) {
+            assert.strictEqual(timeResults[it - 1], startedAt + (interval * it));
+          }
+        });
 
-      it('should abort operation given an abort controller signal', async (t) => {
-        t.mock.timers.enable(['setInterval']);
+        it('should abort operation given an abort controller signal', async (t) => {
+          t.mock.timers.enable({ apis: ['setInterval'] });
 
-        const interval = 100;
-        const abortController = new AbortController();
-        const intervalIterator = nodeTimersPromises.setInterval(interval, Date.now(), {
-          signal: abortController.signal
-        });
+          const interval = 100;
+          const abortController = new AbortController();
+          const intervalIterator = nodeTimersPromises.setInterval(interval, Date.now(), {
+            signal: abortController.signal,
+          });
 
-        const first = intervalIterator.next();
-        const second = intervalIterator.next();
+          const first = intervalIterator.next();
+          const second = intervalIterator.next();
 
-        t.mock.timers.tick(interval);
-        abortController.abort();
-        t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          abortController.abort();
+          t.mock.timers.tick(interval);
 
-        const firstResult = await first;
-        // Interval * 2 because value can be a little bit greater than interval
-        assert.ok(firstResult.value < Date.now() + interval * 2);
-        assert.strictEqual(firstResult.done, false);
+          const firstResult = await first;
+          // Interval * 2 because value can be a little bit greater than interval
+          assert.ok(firstResult.value < Date.now() + interval * 2);
+          assert.strictEqual(firstResult.done, false);
 
-        await assert.rejects(() => second, {
-          name: 'AbortError',
+          await assert.rejects(() => second, {
+            name: 'AbortError',
+          });
         });
 
-      });
-
-      it('should abort operation when .abort is called before calling setInterval', async (t) => {
-        t.mock.timers.enable(['setInterval']);
+        it('should abort operation when .abort is called before calling setInterval', async (t) => {
+          t.mock.timers.enable({ apis: ['setInterval'] });
 
-        const interval = 100;
-        const abortController = new AbortController();
-        abortController.abort();
-        const intervalIterator = nodeTimersPromises.setInterval(interval, Date.now(), {
-          signal: abortController.signal
-        });
+          const interval = 100;
+          const abortController = new AbortController();
+          abortController.abort();
+          const intervalIterator = nodeTimersPromises.setInterval(interval, Date.now(), {
+            signal: abortController.signal,
+          });
 
-        const first = intervalIterator.next();
-        t.mock.timers.tick(interval);
+          const first = intervalIterator.next();
+          t.mock.timers.tick(interval);
 
-        await assert.rejects(() => first, {
-          name: 'AbortError',
+          await assert.rejects(() => first, {
+            name: 'AbortError',
+          });
         });
-      });
 
-      it('should abort operation given an abort controller signal on a real use case', async (t) => {
-        t.mock.timers.enable(['setInterval']);
-        const controller = new AbortController();
-        const signal = controller.signal;
-        const interval = 200;
-        const expectedIterations = 2;
-        const startedAt = Date.now();
-        const timeResults = [];
-        async function run() {
-          const it = nodeTimersPromises.setInterval(interval, startedAt, { signal });
-          for await (const time of it) {
-            timeResults.push(time);
-            if (timeResults.length === 5) break;
+        it('should abort operation given an abort controller signal on a real use case', async (t) => {
+          t.mock.timers.enable({ apis: ['setInterval'] });
+          const controller = new AbortController();
+          const signal = controller.signal;
+          const interval = 200;
+          const expectedIterations = 2;
+          const startedAt = Date.now();
+          const timeResults = [];
+          async function run() {
+            const it = nodeTimersPromises.setInterval(interval, startedAt, { signal });
+            for await (const time of it) {
+              timeResults.push(time);
+              if (timeResults.length === 5) break;
+            }
           }
-        }
 
-        const r = run();
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-        controller.abort();
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-        t.mock.timers.tick(interval);
-
-        await assert.rejects(() => r, {
-          name: 'AbortError',
+          const r = run();
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          controller.abort();
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+          t.mock.timers.tick(interval);
+
+          await assert.rejects(() => r, {
+            name: 'AbortError',
+          });
+          assert.strictEqual(timeResults.length, expectedIterations);
+
+          for (let it = 1; it < expectedIterations; it++) {
+            assert.strictEqual(timeResults[it - 1], startedAt + (interval * it));
+          }
         });
-        assert.strictEqual(timeResults.length, expectedIterations);
-
-        for (let it = 1; it < expectedIterations; it++) {
-          assert.strictEqual(timeResults[it - 1], startedAt + (interval * it));
-        }
-
       });
-
     });
+  });
 
-    describe('setImmediate Suite', () => {
-      it('should advance in time and trigger timers when calling the .tick function multiple times', (t, done) => {
-        t.mock.timers.enable(['setImmediate']);
-        const p = nodeTimersPromises.setImmediate();
-
-        t.mock.timers.tick(5555);
-
-        p.then(common.mustCall((result) => {
-          assert.strictEqual(result, undefined);
-          done();
-        }, 1));
-      });
-
-      it('should work with the same params as the original timers/promises/setImmediate', async (t) => {
-        t.mock.timers.enable(['setImmediate']);
-        const expectedResult = 'result';
-        const controller = new AbortController();
-        const p = nodeTimersPromises.setImmediate(expectedResult, {
-          ref: true,
-          signal: controller.signal
-        });
-
-        t.mock.timers.tick(500);
-
-        const result = await p;
-        assert.strictEqual(result, expectedResult);
-      });
-
-      it('should abort operation if timers/promises/setImmediate received an aborted signal', async (t) => {
-        t.mock.timers.enable(['setImmediate']);
-        const expectedResult = 'result';
-        const controller = new AbortController();
-        const p = nodeTimersPromises.setImmediate(expectedResult, {
-          ref: true,
-          signal: controller.signal
-        });
-
-        controller.abort();
-        t.mock.timers.tick(0);
-
-        await assert.rejects(() => p, {
-          name: 'AbortError',
-        });
-
-      });
-      it('should abort operation even if the .tick wasn\'t called', async (t) => {
-        t.mock.timers.enable(['setImmediate']);
-        const expectedResult = 'result';
-        const controller = new AbortController();
-        const p = nodeTimersPromises.setImmediate(expectedResult, {
-          ref: true,
-          signal: controller.signal
-        });
-
-        controller.abort();
-
-        await assert.rejects(() => p, {
-          name: 'AbortError',
-        });
-      });
+  describe('Date Suite', () => {
+    it('should return the initial UNIX epoch if not specified', (t) => {
+      t.mock.timers.enable({ apis: ['Date'] });
+      const date = new Date();
+      assert.strictEqual(date.getTime(), 0);
+      assert.strictEqual(Date.now(), 0);
+    });
 
-      it('should abort operation when .abort is called before calling setImmediate', async (t) => {
-        t.mock.timers.enable(['setImmediate']);
-        const expectedResult = 'result';
-        const controller = new AbortController();
-        controller.abort();
-        const p = nodeTimersPromises.setImmediate(expectedResult, {
-          ref: true,
-          signal: controller.signal
-        });
+    it('should throw an error if setTime is called without enabling timers', (t) => {
+      assert.throws(
+        () => {
+          t.mock.timers.setTime(100);
+        },
+        { code: 'ERR_INVALID_STATE' }
+      );
+    });
 
-        await assert.rejects(() => p, {
-          name: 'AbortError',
-        });
+    it('should throw an error if epoch passed to enable is not valid', (t) => {
+      assert.throws(
+        () => {
+          t.mock.timers.enable({ now: -1 });
+        },
+        { code: 'ERR_INVALID_ARG_VALUE' }
+      );
+
+      assert.throws(
+        () => {
+          t.mock.timers.enable({ now: 'string' });
+        },
+        { code: 'ERR_INVALID_ARG_TYPE' }
+      );
+
+      assert.throws(
+        () => {
+          t.mock.timers.enable({ now: NaN });
+        },
+        { code: 'ERR_INVALID_ARG_VALUE' }
+      );
+    });
 
-      });
+    it('should replace the original Date with the mocked one', (t) => {
+      t.mock.timers.enable({ apis: ['Date'] });
+      assert.ok(Date.isMock);
+    });
 
-      it('should reject given an an invalid signal instance', async (t) => {
-        t.mock.timers.enable(['setImmediate']);
-        const expectedResult = 'result';
-        const p = nodeTimersPromises.setImmediate(expectedResult, {
-          ref: true,
-          signal: {}
-        });
+    it('should return the ticked time when calling Date.now after tick', (t) => {
+      t.mock.timers.enable({ apis: ['Date'] });
+      const time = 100;
+      t.mock.timers.tick(time);
+      assert.strictEqual(Date.now(), time);
+    });
 
-        await assert.rejects(() => p, {
-          name: 'TypeError',
-          code: 'ERR_INVALID_ARG_TYPE'
-        });
+    it('should return the Date as string when calling it as a function', (t) => {
+      t.mock.timers.enable({ apis: ['Date'] });
+      const returned = Date();
+      // Matches the format: 'Mon Jan 01 1970 00:00:00'
+      // We don't care about the date, just the format
+      assert.ok(/\w{3}\s\w{3}\s\d{1,2}\s\d{2,4}\s\d{1,2}:\d{2}:\d{2}/.test(returned));
+    });
 
-      });
+    it('should return the date with different argument calls', (t) => {
+      t.mock.timers.enable({ apis: ['Date'] });
+      assert.strictEqual(new Date(0).getTime(), 0);
+      assert.strictEqual(new Date(100).getTime(), 100);
+      assert.strictEqual(new Date('1970-01-01T00:00:00.000Z').getTime(), 0);
+      assert.strictEqual(new Date(1970, 0).getFullYear(), 1970);
+      assert.strictEqual(new Date(1970, 0).getMonth(), 0);
+      assert.strictEqual(new Date(1970, 0, 1).getDate(), 1);
+      assert.strictEqual(new Date(1970, 0, 1, 11).getHours(), 11);
+      assert.strictEqual(new Date(1970, 0, 1, 11, 10).getMinutes(), 10);
+      assert.strictEqual(new Date(1970, 0, 1, 11, 10, 45).getSeconds(), 45);
+      assert.strictEqual(new Date(1970, 0, 1, 11, 10, 45, 898).getMilliseconds(), 898);
+      assert.strictEqual(new Date(1970, 0, 1, 11, 10, 45, 898).toDateString(), 'Thu Jan 01 1970');
+    });
 
-      it('should execute in order if setImmediate is called multiple times', async (t) => {
-        t.mock.timers.enable(['setImmediate']);
+    it('should return native code when calling Date.toString', (t) => {
+      t.mock.timers.enable({ apis: ['Date'] });
+      assert.strictEqual(Date.toString(), 'function Date() { [native code] }');
+    });
 
-        const p1 = nodeTimersPromises.setImmediate('fn1');
-        const p2 = nodeTimersPromises.setImmediate('fn2');
+    it('should start with a custom epoch if the second argument is specified', (t) => {
+      t.mock.timers.enable({ apis: ['Date'], now: 100 });
+      const date1 = new Date();
+      assert.strictEqual(date1.getTime(), 100);
 
-        t.mock.timers.tick(0);
+      t.mock.timers.reset();
+      t.mock.timers.enable({ apis: ['Date'], now: new Date(200) });
+      const date2 = new Date();
+      assert.strictEqual(date2.getTime(), 200);
+    });
 
-        const results = await Promise.race([p1, p2]);
+    it('should replace epoch if setTime is lesser than now and not tick', (t) => {
+      t.mock.timers.enable();
+      const fn = t.mock.fn();
+      const id = setTimeout(fn, 1000);
+      t.mock.timers.setTime(800);
+      assert.strictEqual(Date.now(), 800);
+      t.mock.timers.setTime(500);
+      assert.strictEqual(Date.now(), 500);
+      assert.strictEqual(fn.mock.callCount(), 0);
+      clearTimeout(id);
+    });
 
-        assert.strictEqual(results, 'fn1');
-      });
+    it('should not tick time when setTime is called', (t) => {
+      t.mock.timers.enable();
+      const fn = t.mock.fn();
+      const id = setTimeout(fn, 1000);
+      t.mock.timers.setTime(1200);
+      assert.strictEqual(Date.now(), 1200);
+      assert.strictEqual(fn.mock.callCount(), 0);
+      clearTimeout(id);
     });
   });
 });

From a79494450301d7702c96b540389f2046b6373a6d Mon Sep 17 00:00:00 2001
From: Lucas Santos <lhs.santoss@gmail.com>
Date: Tue, 10 Oct 2023 20:50:04 +0200
Subject: [PATCH 2/4] Apply suggestions from code review

Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
---
 doc/api/test.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/doc/api/test.md b/doc/api/test.md
index 6cd360da4f41b6..3625226c6c635a 100644
--- a/doc/api/test.md
+++ b/doc/api/test.md
@@ -496,7 +496,7 @@ test('spies on an object method', (t) => {
 ### Timers
 
 Mocking timers is a technique commonly used in software testing to simulate and
-control the behavior of timers, such as `setInterval` and `setTimeout`
+control the behavior of timers, such as `setInterval` and `setTimeout`,
 without actually waiting for the specified time intervals.
 
 Refer to the [`MockTimers`][] class for a full list of methods and features.
@@ -2024,7 +2024,7 @@ test('mocks setTimeout to be executed synchronously without having to actually w
 });
 ```
 
-```js
+```cjs
 const assert = require('node:assert');
 const { test } = require('node:test');
 
@@ -2310,7 +2310,7 @@ test('runAll functions following the given order', (context) => {
 });
 ```
 
-```js
+```cjs
 const assert = require('node:assert');
 const { test } = require('node:test');
 
@@ -2352,7 +2352,7 @@ test('runAll functions following the given order', (context) => {
 });
 ```
 
-```js
+```cjs
 const assert = require('node:assert');
 const { test } = require('node:test');
 

From ea24c0a95d1ae8047131554952132aa0d16161de Mon Sep 17 00:00:00 2001
From: Lucas Santos <lhs.santoss@gmail.com>
Date: Tue, 10 Oct 2023 20:50:58 +0200
Subject: [PATCH 3/4] Apply suggestions from code review

Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
---
 doc/api/test.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/doc/api/test.md b/doc/api/test.md
index 3625226c6c635a..8c2c8e2560d425 100644
--- a/doc/api/test.md
+++ b/doc/api/test.md
@@ -1851,7 +1851,7 @@ import { mock } from 'node:test';
 mock.timers.enable({ apis: ['Date'], now: 1000 });
 ```
 
-```js
+```cjs
 const { mock } = require('node:test');
 mock.timers.enable({ apis: ['Date'], now: 1000 });
 ```
@@ -1863,7 +1863,7 @@ import { mock } from 'node:test';
 mock.timers.enable({ apis: ['Date'], now: new Date() });
 ```
 
-```js
+```cjs
 const { mock } = require('node:test');
 mock.timers.enable({ apis: ['Date'], now: new Date() });
 ```

From 8991402b81d24e7479dff2e076147c19ecc07bb8 Mon Sep 17 00:00:00 2001
From: Lucas Santos <lhs.santoss@gmail.com>
Date: Mon, 16 Oct 2023 20:25:37 +0200
Subject: [PATCH 4/4] Apply suggestions from code review

Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
---
 doc/api/test.md | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/doc/api/test.md b/doc/api/test.md
index 8c2c8e2560d425..715086cafd475a 100644
--- a/doc/api/test.md
+++ b/doc/api/test.md
@@ -635,7 +635,7 @@ test('mocks the Date object', (context) => {
 });
 ```
 
-```js
+```cjs
 const assert = require('node:assert');
 const { test } = require('node:test');
 
@@ -672,7 +672,7 @@ test('mocks the Date object with initial time', (context) => {
 });
 ```
 
-```js
+```cjs
 const assert = require('node:assert');
 const { test } = require('node:test');
 
@@ -711,7 +711,7 @@ test('sets the time of a date object', (context) => {
 });
 ```
 
-```js
+```cjs
 const assert = require('node:assert');
 const { test } = require('node:test');
 
@@ -753,7 +753,7 @@ test('runs timers as setTime passes ticks', (context) => {
 });
 ```
 
-```js
+```cjs
 const assert = require('node:assert');
 const { test } = require('node:test');
 
@@ -798,7 +798,7 @@ test('runs timers as setTime passes ticks', (context) => {
 });
 ```
 
-```js
+```cjs
 const assert = require('node:assert');
 const { test } = require('node:test');