Feature: Add Business Hours Check Extension Method

src/DateTimeExtensions/BusinessHoursExtensions.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace DateTimeExtensions
+{
+    public static class BusinessHoursExtensions
+    {
+        /// <summary>
+        /// This method helps determine if a given time is during standard working hours.
+        /// </summary>
+        /// <param name="startTime">Start time of the business hours.</param>
+        /// <param name="endTime">End time of the business hours.</param>
+        /// <returns>If given time is during business hours, method returns true else it returns false.</returns>
+        public static bool IsWithinBusinessHours(this DateTime dateTime, TimeSpan startTime, TimeSpan endTime)
+        {
+            var currentTime = dateTime.TimeOfDay;
+            //if startTime is less than endTime (ex:Business hours from 9AM to 5PM)
+            if (startTime <= endTime)
+            {
+                return currentTime >= startTime && currentTime <= endTime;
+            }
+            //if startTime is greater than endTime (ex:Business hours from 9PM to 5AM)
+            else
+            {
+                return currentTime >= startTime || currentTime <= endTime;
+            }
+        }
+    }
+}

tests/DateTimeExtensions.Tests/BusinessHoursTests.cs

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+using System;
+using NUnit.Framework;
+using DateTimeExtensions;
+
+namespace DateTimeExtensions.Tests
+{
+    [TestFixture]
+    public class BusinessHoursTests
+    {
+        [Test]
+        public void check_is_within_regular_business_hours()
+        {
+            //Business hours are from 9AM to 5PM
+            var startTime = new TimeSpan(9, 0, 0); // 9 AM
+            var endTime = new TimeSpan(17, 0, 0); // 5 PM
+
+            var withinHoursDate = new DateTime(2024, 11, 12, 10, 30, 0); // 10:30 AM
+            Assert.IsTrue(withinHoursDate.IsWithinBusinessHours(startTime, endTime));
+
+            var outsideHoursDate = new DateTime(2024, 11, 12, 18, 22, 0); // 6:22 PM
+            Assert.IsFalse(outsideHoursDate.IsWithinBusinessHours(startTime, endTime));
+        }
+
+        [Test]
+        public void check_is_within_overnight_business_hours()
+        {
+            //Business hours are from 9AM to 5PM
+            var startTime = new TimeSpan(19, 0, 0); // 9 AM
+            var endTime = new TimeSpan(5, 0, 0); // 5 PM
+
+            var withinHoursDate = new DateTime(2024, 11, 12, 22, 0, 20); // 10:00:20 PM
+            Assert.IsTrue(withinHoursDate.IsWithinBusinessHours(startTime, endTime));
+
+            var outsideHoursDate = new DateTime(2024, 11, 12, 12, 30, 44); // 12:30:44 PM
+            Assert.IsFalse(outsideHoursDate.IsWithinBusinessHours(startTime, endTime));
+        }
+    }
+}