fix(datetime): add dev warnings when setting out of bounds value

core/src/components/datetime/datetime.tsx

@@ -11,6 +11,7 @@ import { isRTL } from '../../utils/rtl';
 import { createColorClasses } from '../../utils/theme';
 import type { PickerColumnItem } from '../picker-column-internal/picker-column-internal-interfaces';
 
+import { warnIfValueOutOfBounds } from './utils/comparison';
 import {
   generateMonths,
   generateTime,
@@ -326,6 +327,8 @@ export class Datetime implements ComponentInterface {
        */
       const valueDateParts = parseDate(this.value);
       if (valueDateParts) {
+        warnIfValueOutOfBounds(valueDateParts, this.minParts, this.maxParts);
+
         const { month, day, year, hour, minute } = valueDateParts;
         const ampm = hour >= 12 ? 'pm' : 'am';
 
@@ -1084,7 +1087,11 @@ export class Datetime implements ComponentInterface {
   private processValue = (value?: string | null) => {
     this.highlightActiveParts = !!value;
     const valueToProcess = parseDate(value || getToday());
-    const { month, day, year, hour, minute, tzOffset } = clampDate(valueToProcess, this.minParts, this.maxParts);
+
+    const { minParts, maxParts } = this;
+    warnIfValueOutOfBounds(valueToProcess, minParts, maxParts);
+
+    const { month, day, year, hour, minute, tzOffset } = clampDate(valueToProcess, minParts, maxParts);
 
     this.setWorkingParts({
       month,

core/src/components/datetime/test/minmax/datetime.e2e.ts

@@ -1,4 +1,5 @@
 import { expect } from '@playwright/test';
+import type { E2EPage } from '@utils/test/playwright';
 import { test } from '@utils/test/playwright';
 
 test.describe('datetime: minmax', () => {
@@ -47,6 +48,7 @@ test.describe('datetime: minmax', () => {
     expect(nextButton).toBeDisabled();
     expect(prevButton).toBeEnabled();
   });
+
   test('datetime: minmax months disabled', async ({ page }) => {
     await page.goto('/src/components/datetime/test/minmax');
     const calendarMonths = page.locator('ion-datetime#inside .calendar-month');
@@ -67,6 +69,7 @@ test.describe('datetime: minmax', () => {
     expect(navButtons.nth(0)).toHaveAttribute('disabled', '');
     expect(navButtons.nth(1)).toHaveAttribute('disabled', '');
   });
+
   test('datetime: min including day should not disable month', async ({ page }) => {
     await page.goto('/src/components/datetime/test/minmax');
     await page.waitForSelector('.datetime-ready');
@@ -77,6 +80,7 @@ test.describe('datetime: minmax', () => {
     expect(calendarMonths.nth(1)).not.toHaveClass(/calendar-month-disabled/);
     expect(calendarMonths.nth(2)).not.toHaveClass(/calendar-month-disabled/);
   });
+
   test.describe('when the datetime does not have a value', () => {
     test('all time values should be available for selection', async ({ page }) => {
       /**
@@ -105,4 +109,29 @@ test.describe('datetime: minmax', () => {
       expect(await minutes.count()).toBe(60);
     });
   });
+
+  test.describe('setting value outside bounds should show in-bounds month', () => {
+    const testDisplayedMonth = async (page: E2EPage, content: string) => {
+      await page.setContent(content);
+      await page.waitForSelector('.datetime-ready');
+
+      const calendarMonthYear = page.locator('ion-datetime .calendar-month-year');
+      expect(calendarMonthYear).toHaveText('June 2021');
+    };
+
+    test('when min is defined', async ({ page }) => {
+      await testDisplayedMonth(page, `<ion-datetime min="2021-06-01" value="2021-05-01"></ion-datetime>`);
+    });
+
+    test('when max is defined', async ({ page }) => {
+      await testDisplayedMonth(page, `<ion-datetime max="2021-06-30" value="2021-07-01"></ion-datetime>`);
+    });
+
+    test('when both min and max are defined', async ({ page }) => {
+      await testDisplayedMonth(
+        page,
+        `<ion-datetime min="2021-06-01" max="2021-06-30" value="2021-05-01"></ion-datetime>`
+      );
+    });
+  });
 });

core/src/components/datetime/utils/comparison.ts

@@ -1,3 +1,5 @@
+import { printIonWarning } from '@utils/logging';
+
 import type { DatetimeParts } from '../datetime-interface';
 
 /**
@@ -36,3 +38,14 @@ export const isAfter = (baseParts: DatetimeParts, compareParts: DatetimeParts) =
       baseParts.day > compareParts.day!)
   );
 };
+
+export const warnIfValueOutOfBounds = (value: DatetimeParts, min: DatetimeParts, max: DatetimeParts) => {
+  if ((min && isBefore(value, min)) || (max && isAfter(value, max))) {
+    printIonWarning(
+      'The value provided to ion-datetime is out of bounds.\n\n' +
+        `Min: ${JSON.stringify(min)}\n` +
+        `Max: ${JSON.stringify(max)}\n` +
+        `Value: ${JSON.stringify(value)}`
+    );
+  }
+};