From d7a911ce23d4a6c11c7181538dd6a6bd0e838aeb Mon Sep 17 00:00:00 2001
From: Fabian Enos <fabian.enos@gmail.com>
Date: Mon, 23 Oct 2023 19:06:19 +0530
Subject: [PATCH] feat: Added support for floating point tzOffset (#297)

---
 src/expressionDescriptor.ts | 26 ++++++++++++++++++++++++--
 test/cronstrue.ts           | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/src/expressionDescriptor.ts b/src/expressionDescriptor.ts
index d05b391..737d963 100644
--- a/src/expressionDescriptor.ts
+++ b/src/expressionDescriptor.ts
@@ -633,7 +633,30 @@ export class ExpressionDescriptor {
   }
 
   protected formatTime(hourExpression: string, minuteExpression: string, secondExpression: string) {
-    let hour: number = parseInt(hourExpression) + (this.options.tzOffset ? this.options.tzOffset : 0);
+    let hourOffset: number = 0;
+    let minuteOffset: number = 0;
+    
+    if(this.options.tzOffset) {
+      hourOffset = this.options.tzOffset > 0 ? Math.floor(this.options.tzOffset) : Math.ceil(this.options.tzOffset);
+
+      minuteOffset = (parseFloat((this.options.tzOffset % 1).toFixed(2)));
+
+      if(minuteOffset != 0) {
+        minuteOffset *= 60;
+      }
+    }
+
+    let hour: number = parseInt(hourExpression) + (hourOffset);
+    let minute: number = parseInt(minuteExpression) + (minuteOffset);
+
+    if (minute >= 60) {
+      minute -= 60;
+      hour += 1;
+    } else if (minute < 0) {
+      minute += 60;
+      hour -= 1;
+    }
+    
     if (hour >= 24) {
       hour = hour - 24;
     } else if (hour < 0) {
@@ -652,7 +675,6 @@ export class ExpressionDescriptor {
       }
     }
 
-    const minute = minuteExpression;
     let second: string = "";
     if (secondExpression) {
       second = `:${("00" + secondExpression).substring(secondExpression.length)}`;
diff --git a/test/cronstrue.ts b/test/cronstrue.ts
index ab3e11c..638546f 100644
--- a/test/cronstrue.ts
+++ b/test/cronstrue.ts
@@ -159,6 +159,42 @@ describe("Cronstrue", function () {
       }), "At 02:30 PM");
     });
 
+    it("31 10 * * *", function () {
+      assert.equal(cronstrue.toString(this.test?.title as string,{
+        tzOffset: 5.5
+      }), "At 04:01 PM");
+    });
+
+    it("29 10 * * *", function () {
+      assert.equal(cronstrue.toString(this.test?.title as string,{
+        tzOffset: 5.5
+      }), "At 03:59 PM");
+    });
+
+    it("30 10 * * *", function () {
+      assert.equal(cronstrue.toString(this.test?.title as string,{
+        tzOffset: 5.5
+      }), "At 04:00 PM");
+    });
+
+    it("31 10 * * *", function () {
+      assert.equal(cronstrue.toString(this.test?.title as string,{
+        tzOffset: -1.5
+      }), "At 09:01 AM");
+    });
+
+    it("29 10 * * *", function () {
+      assert.equal(cronstrue.toString(this.test?.title as string,{
+        tzOffset: -1.5
+      }), "At 08:59 AM");
+    });
+
+    it("30 10 * * *", function () {
+      assert.equal(cronstrue.toString(this.test?.title as string,{
+        tzOffset: -1.5
+      }), "At 09:00 AM");
+    });
+
     it("30 11 * * *", function () {
       assert.equal(cronstrue.toString(this.test?.title as string,{
         tzOffset:3,