diff --git a/src/Skybrud.Essentials/Time/TimeUtils.DateTime.cs b/src/Skybrud.Essentials/Time/TimeUtils.DateTime.cs
index afa942a..97f12ac 100644
--- a/src/Skybrud.Essentials/Time/TimeUtils.DateTime.cs
+++ b/src/Skybrud.Essentials/Time/TimeUtils.DateTime.cs
@@ -118,6 +118,37 @@ public static DateTime GetEndOfMonth(DateTime time) {
 
         #endregion
 
+        #region Get ... of quarter
+
+        /// <summary>
+        /// Returns the quarter of the specified <paramref name="timestamp"/>.
+        /// </summary>
+        /// <param name="timestamp">An instance of <see cref="DateTime"/> representing the timestamp.</param>
+        /// <returns>An <see cref="int"/> representing the quarter.</returns>
+        public static int GetQuarter(DateTime timestamp) {
+            return (int) Math.Ceiling(timestamp.Month / 3d);
+        }
+
+        /// <summary>
+        /// Returns a new <see cref="DateTime"/> representing the start of the quarter of the specified <paramref name="timestamp"/>.
+        /// </summary>
+        /// <param name="timestamp">The timestamp.</param>
+        /// <returns>An instance of <see cref="DateTime"/> representing the start of the quarter.</returns>
+        public static DateTime GetStartOfQuarter(DateTime timestamp) {
+            return GetStartOfQuarter(timestamp.Year, GetQuarter(timestamp)).DateTime;
+        }
+
+        /// <summary>
+        /// Returns a new <see cref="DateTime"/> representing the quarter of the specified <paramref name="timestamp"/>.
+        /// </summary>
+        /// <param name="timestamp">The timestamp.</param>
+        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the start of the quarter.</returns>
+        public static DateTime GetEndOfQuarter(DateTime timestamp) {
+            return GetEndOfQuarter(timestamp.Year, GetQuarter(timestamp)).DateTime;
+        }
+
+        #endregion
+
         #region Is...
 
         /// <summary>
diff --git a/src/Skybrud.Essentials/Time/TimeUtils.DateTimeOffset.cs b/src/Skybrud.Essentials/Time/TimeUtils.DateTimeOffset.cs
index ebbfd7b..d42bc1e 100644
--- a/src/Skybrud.Essentials/Time/TimeUtils.DateTimeOffset.cs
+++ b/src/Skybrud.Essentials/Time/TimeUtils.DateTimeOffset.cs
@@ -183,6 +183,84 @@ public static DateTimeOffset GetEndOfMonth(DateTimeOffset time, TimeZoneInfo? ti
 
         #endregion
 
+        #region Get ... of quarter
+
+        /// <summary>
+        /// Returns the quarter of the specified <paramref name="timestamp"/>.
+        /// </summary>
+        /// <param name="timestamp">An instance of <see cref="DateTimeOffset"/> representing the timestamp.</param>
+        /// <returns>An <see cref="int"/> representing the quarter.</returns>
+        public static int GetQuarter(DateTimeOffset timestamp) {
+            return (int) Math.Ceiling(timestamp.Month / 3d);
+        }
+
+        /// <summary>
+        /// Returns a new <see cref="DateTimeOffset"/> representing the start of the quarter of the specified <paramref name="timestamp"/>.
+        /// </summary>
+        /// <param name="timestamp">The timestamp.</param>
+        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the start of the quarter.</returns>
+        public static DateTimeOffset GetStartOfQuarter(DateTimeOffset timestamp) {
+            return new DateTimeOffset(timestamp.Year, 3 * GetQuarter(timestamp) - 2, 1, 0, 0, 0, timestamp.Offset);
+        }
+
+        /// <summary>
+        /// Returns a new <see cref="DateTimeOffset"/> representing the start of the quarter of the specified <paramref name="timestamp"/>.
+        /// </summary>
+        /// <param name="timestamp">The timestamp.</param>
+        /// <param name="timeZone">The time zone for which the reuslt should be adjusted.</param>
+        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the start of the quarter.</returns>
+        public static DateTimeOffset GetStartOfQuarter(DateTimeOffset timestamp, TimeZoneInfo? timeZone) {
+
+            // Get the start of the quarter
+            var start = GetStartOfQuarter(timestamp);
+
+            // Adjust to the specified time zone
+            start = timeZone == null ? start : TimeZoneInfo.ConvertTime(start, timeZone);
+
+            // Adjust for dayligt savings
+            if (start.Hour == 23) start = start.AddHours(+1);
+            if (start.Hour == 01) start = start.AddHours(-1);
+
+            return start;
+
+        }
+
+        /// <summary>
+        /// Returns a new <see cref="DateTimeOffset"/> representing the end of the quarter of the specified <paramref name="timestamp"/>.
+        /// </summary>
+        /// <param name="timestamp">The timestamp.</param>
+        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the end of the quarter.</returns>
+        public static DateTimeOffset GetEndOfQuarter(DateTimeOffset timestamp) {
+            return GetEndOfQuarter(timestamp.Year, GetQuarter(timestamp));
+        }
+
+        /// <summary>
+        /// Returns a new <see cref="DateTimeOffset"/> representing the end of the quarter of the specified <paramref name="timestamp"/>.
+        /// </summary>
+        /// <param name="timestamp">The timestamp.</param>
+        /// <param name="timeZone">The time zone for which the reuslt should be adjusted.</param>
+        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the end of the quarter.</returns>
+        public static DateTimeOffset GetEndOfQuarter(DateTimeOffset timestamp, TimeZoneInfo? timeZone) {
+
+            // Get the end of the quarter
+            var end = GetEndOfQuarter(timestamp);
+
+            // Adjust to the specified time zone
+            end = timeZone == null ? end : TimeZoneInfo.ConvertTime(end, timeZone);
+
+            // Adjust for dayligt savings
+            switch (end.Hour) {
+                case 22: end = end.AddHours(+1); break;
+                case 00: end = end.AddHours(-1); break;
+                case 01: end = end.AddHours(-2); break;
+            }
+
+            return end;
+
+        }
+
+        #endregion
+
         #region Is...
 
         /// <summary>
diff --git a/src/Skybrud.Essentials/Time/TimeUtils.Quarters.cs b/src/Skybrud.Essentials/Time/TimeUtils.Quarters.cs
index f4dfa5c..a0c2388 100644
--- a/src/Skybrud.Essentials/Time/TimeUtils.Quarters.cs
+++ b/src/Skybrud.Essentials/Time/TimeUtils.Quarters.cs
@@ -6,22 +6,53 @@ namespace Skybrud.Essentials.Time {
 
     public static partial class TimeUtils {
 
-        /// <summary>
-        /// Returns the quarter of the specified <paramref name="timestamp"/>.
-        /// </summary>
-        /// <param name="timestamp">An instance of <see cref="DateTime"/> representing the timestamp.</param>
-        /// <returns>An <see cref="int"/> representing the quarter.</returns>
-        public static int GetQuarter(DateTime timestamp) {
-            return (int) Math.Ceiling(timestamp.Month / 3d);
+        internal static int GetStartMonthOfQuarter(int quarter) {
+            return 3 * quarter - 2;
+        }
+
+        internal static int GetStartMonthOfQuarter(DateTime date) {
+            return GetStartMonthOfQuarter(GetQuarter(date));
+        }
+
+        internal static int GetStartMonthOfQuarter(DateTimeOffset date) {
+            return GetStartMonthOfQuarter(GetQuarter(date));
+        }
+
+        internal static int GetStartMonthOfQuarter(EssentialsDate date) {
+            return GetStartMonthOfQuarter(GetQuarter(date));
+        }
+
+        internal static int GetStartMonthOfQuarter(EssentialsTime date) {
+            return GetStartMonthOfQuarter(GetQuarter(date));
+        }
+
+        internal static int GetEndMonthOfQuarter(int quarter) {
+            return 3 * quarter + 1;
+        }
+
+        internal static int GetEndMonthOfQuarter(DateTime date) {
+            return GetEndMonthOfQuarter(GetQuarter(date));
+        }
+
+        internal static int GetEndMonthOfQuarter(DateTimeOffset date) {
+            return GetEndMonthOfQuarter(GetQuarter(date));
+        }
+
+        internal static int GetEndMonthOfQuarter(EssentialsDate date) {
+            return GetEndMonthOfQuarter(GetQuarter(date));
+        }
+
+        internal static int GetEndMonthOfQuarter(EssentialsTime date) {
+            return GetEndMonthOfQuarter(GetQuarter(date));
         }
 
         /// <summary>
-        /// Returns the quarter of the specified <paramref name="timestamp"/>.
+        /// Returns the quarter of the specified <paramref name="date"/>.
         /// </summary>
-        /// <param name="timestamp">An instance of <see cref="DateTimeOffset"/> representing the timestamp.</param>
+        /// <param name="date">An instance of <see cref="EssentialsTime"/> representing the date.</param>
         /// <returns>An <see cref="int"/> representing the quarter.</returns>
-        public static int GetQuarter(DateTimeOffset timestamp) {
-            return (int) Math.Ceiling(timestamp.Month / 3d);
+        public static int GetQuarter(EssentialsDate date) {
+            return (int) Math.Ceiling(date.Month / 3d);
         }
 
         /// <summary>
@@ -54,46 +85,6 @@ public static DateTimeOffset GetStartOfQuarter(int year, int quarter, TimeSpan o
             return new DateTimeOffset(year, 3 * quarter - 2, 1, 0, 0, 0, offset);
         }
 
-        /// <summary>
-        /// Returns a new <see cref="DateTime"/> representing the start of the quarter of the specified <paramref name="timestamp"/>.
-        /// </summary>
-        /// <param name="timestamp">The timestamp.</param>
-        /// <returns>An instance of <see cref="DateTime"/> representing the start of the quarter.</returns>
-        public static DateTime GetStartOfQuarter(DateTime timestamp) {
-            return GetStartOfQuarter(timestamp.Year, GetQuarter(timestamp)).DateTime;
-        }
-
-        /// <summary>
-        /// Returns a new <see cref="DateTimeOffset"/> representing the start of the quarter of the specified <paramref name="timestamp"/>.
-        /// </summary>
-        /// <param name="timestamp">The timestamp.</param>
-        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the start of the quarter.</returns>
-        public static DateTimeOffset GetStartOfQuarter(DateTimeOffset timestamp) {
-            return new DateTimeOffset(timestamp.Year, 3 * GetQuarter(timestamp) - 2, 1, 0, 0, 0, timestamp.Offset);
-        }
-
-        /// <summary>
-        /// Returns a new <see cref="DateTimeOffset"/> representing the start of the quarter of the specified <paramref name="timestamp"/>.
-        /// </summary>
-        /// <param name="timestamp">The timestamp.</param>
-        /// <param name="timeZone">The time zone for which the reuslt should be adjusted.</param>
-        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the start of the quarter.</returns>
-        public static DateTimeOffset GetStartOfQuarter(DateTimeOffset timestamp, TimeZoneInfo? timeZone) {
-
-            // Get the start of the quarter
-            var start = GetStartOfQuarter(timestamp);
-
-            // Adjust to the specified time zone
-            start = timeZone == null ? start : TimeZoneInfo.ConvertTime(start, timeZone);
-
-            // Adjust for dayligt savings
-            if (start.Hour == 23) start = start.AddHours(+1);
-            if (start.Hour == 01) start = start.AddHours(-1);
-
-            return start;
-
-        }
-
         /// <summary>
         /// Returns a new <see cref="EssentialsTime"/> representing the start of the quarter of the specified <paramref name="timestamp"/>.
         /// </summary>
@@ -133,49 +124,6 @@ public static DateTimeOffset GetEndOfQuarter(int year, int quarter, TimeSpan off
 
         }
 
-        /// <summary>
-        /// Returns a new <see cref="DateTime"/> representing the quarter of the specified <paramref name="timestamp"/>.
-        /// </summary>
-        /// <param name="timestamp">The timestamp.</param>
-        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the start of the quarter.</returns>
-        public static DateTime GetEndOfQuarter(DateTime timestamp) {
-            return GetEndOfQuarter(timestamp.Year, GetQuarter(timestamp)).DateTime;
-        }
-
-        /// <summary>
-        /// Returns a new <see cref="DateTimeOffset"/> representing the end of the quarter of the specified <paramref name="timestamp"/>.
-        /// </summary>
-        /// <param name="timestamp">The timestamp.</param>
-        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the end of the quarter.</returns>
-        public static DateTimeOffset GetEndOfQuarter(DateTimeOffset timestamp) {
-            return GetEndOfQuarter(timestamp.Year, GetQuarter(timestamp));
-        }
-
-        /// <summary>
-        /// Returns a new <see cref="DateTimeOffset"/> representing the end of the quarter of the specified <paramref name="timestamp"/>.
-        /// </summary>
-        /// <param name="timestamp">The timestamp.</param>
-        /// <param name="timeZone">The time zone for which the reuslt should be adjusted.</param>
-        /// <returns>An instance of <see cref="DateTimeOffset"/> representing the end of the quarter.</returns>
-        public static DateTimeOffset GetEndOfQuarter(DateTimeOffset timestamp, TimeZoneInfo? timeZone) {
-
-            // Get the end of the quarter
-            var end = GetEndOfQuarter(timestamp);
-
-            // Adjust to the specified time zone
-            end = timeZone == null ? end : TimeZoneInfo.ConvertTime(end, timeZone);
-
-            // Adjust for dayligt savings
-            switch (end.Hour) {
-                case 22: end = end.AddHours(+1); break;
-                case 00: end = end.AddHours(-1); break;
-                case 01: end = end.AddHours(-2); break;
-            }
-
-            return end;
-
-        }
-
         /// <summary>
         /// Returns a new <see cref="EssentialsTime"/> representing the end of the quarter of the specified <paramref name="timestamp"/>.
         /// </summary>
diff --git a/src/UnitTestProject1/Time/DateTimeOffsetTests.cs b/src/UnitTestProject1/Time/Time/DateTimeOffsetTests.cs
similarity index 75%
rename from src/UnitTestProject1/Time/DateTimeOffsetTests.cs
rename to src/UnitTestProject1/Time/Time/DateTimeOffsetTests.cs
index 67726ee..d52c870 100644
--- a/src/UnitTestProject1/Time/DateTimeOffsetTests.cs
+++ b/src/UnitTestProject1/Time/Time/DateTimeOffsetTests.cs
@@ -3,7 +3,7 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Skybrud.Essentials.Time;
 
-namespace UnitTestProject1.Time {
+namespace UnitTestProject1.Time.Time {
 
     [TestClass]
     public class DateTimeOffsetTests {
@@ -118,7 +118,7 @@ public void GetEndOfDay() {
 
                 Assert.AreEqual(s.Expected, result2.ToString(Format), $"Sample at index {i} failed test (EssentialsTime)");
 
-                Assert.AreEqual(s.Expected, result2.ToString(Format), $"Sample at index {i} failed test (EssentialsTime)");
+                Assert.AreEqual(s.Expected, result3.ToString(Format), $"Sample at index {i} failed test (EssentialsTime)");
 
             }
 
@@ -352,6 +352,120 @@ public void GetEndOfMonth() {
 
         }
 
+        [TestMethod]
+        public void GetStartOfQuarter() {
+
+            TimeZoneInfo utc = TimeZoneInfo.FindSystemTimeZoneById("UTC");
+            TimeZoneInfo romance = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time");
+
+            var samples = new[] {
+
+                new GetOfDaySample("2019-01-01 00:00:00:000 +00:00", "2019-03-18 12:00:00:000 +00:00", null),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +00:00", "2019-03-23 12:00:00:000 +00:00", null),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +00:00", "2019-03-26 12:00:00:000 +00:00", null),
+
+                new GetOfDaySample("2019-01-01 00:00:00:000 +00:00", "2019-03-18 12:00:00:000 +00:00", utc),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +00:00", "2019-03-23 12:00:00:000 +00:00", utc),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +00:00", "2019-03-26 12:00:00:000 +00:00", utc),
+
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-23 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-24 12:00:00:000 +01:00", romance),
+
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-25 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-26 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-27 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-28 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-29 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-30 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-01-01 00:00:00:000 +01:00", "2019-03-31 12:00:00:000 +02:00", romance),
+
+                new GetOfDaySample("2019-04-01 00:00:00:000 +02:00", "2019-04-01 12:00:00:000 +02:00", romance),
+                new GetOfDaySample("2019-04-01 00:00:00:000 +02:00", "2019-04-02 12:00:00:000 +02:00", romance),
+
+                new GetOfDaySample("2019-10-01 00:00:00:000 +02:00", "2019-10-23 12:00:00:000 +02:00", romance),
+                new GetOfDaySample("2019-10-01 00:00:00:000 +02:00", "2019-10-25 12:00:00:000 +02:00", romance),
+                new GetOfDaySample("2019-10-01 00:00:00:000 +02:00", "2019-10-27 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-10-01 00:00:00:000 +02:00", "2019-10-29 12:00:00:000 +01:00", romance)
+
+            };
+
+            for (int i = 0; i < samples.Length; i++) {
+
+                var s = samples[i];
+
+                DateTimeOffset result1 = TimeUtils.GetStartOfQuarter(s.Time, s.TimeZone);
+
+                EssentialsTime result2 = new EssentialsTime(s.Time, s.TimeZone).GetStartOfQuarter();
+
+                EssentialsTime result3 = new EssentialsTime(s.Time, s.TimeZone).GetStartOfQuarter(s.TimeZone);
+
+                Assert.AreEqual(s.Expected, result1.ToString(Format), $"Sample at index {i} failed test (DateTimeOffset)");
+
+                Assert.AreEqual(s.Expected, result2.ToString(Format), $"Sample at index {i} failed test (EssentialsTime)");
+
+                Assert.AreEqual(s.Expected, result3.ToString(Format), $"Sample at index {i} failed test (EssentialsTime)");
+
+            }
+
+        }
+
+        [TestMethod]
+        public void GetEndOfQuarter() {
+
+            TimeZoneInfo utc = TimeZoneInfo.FindSystemTimeZoneById("UTC");
+            TimeZoneInfo romance = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time");
+
+            var samples = new[] {
+
+                new GetOfDaySample("2019-03-31 23:59:59:999 +00:00", "2019-03-18 12:00:00:000 +00:00", null),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +00:00", "2019-03-23 12:00:00:000 +00:00", null),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +00:00", "2019-03-26 12:00:00:000 +00:00", null),
+
+                new GetOfDaySample("2019-03-31 23:59:59:999 +00:00", "2019-03-18 12:00:00:000 +00:00", utc),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +00:00", "2019-03-23 12:00:00:000 +00:00", utc),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +00:00", "2019-03-26 12:00:00:000 +00:00", utc),
+
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-23 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-24 12:00:00:000 +01:00", romance),
+
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-25 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-26 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-27 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-28 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-29 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-30 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-03-31 23:59:59:999 +02:00", "2019-03-31 12:00:00:000 +02:00", romance),
+
+                new GetOfDaySample("2019-06-30 23:59:59:999 +02:00", "2019-04-01 12:00:00:000 +02:00", romance),
+                new GetOfDaySample("2019-06-30 23:59:59:999 +02:00", "2019-04-02 12:00:00:000 +02:00", romance),
+
+                new GetOfDaySample("2019-12-31 23:59:59:999 +01:00", "2019-10-23 12:00:00:000 +02:00", romance),
+                new GetOfDaySample("2019-12-31 23:59:59:999 +01:00", "2019-10-25 12:00:00:000 +02:00", romance),
+                new GetOfDaySample("2019-12-31 23:59:59:999 +01:00", "2019-10-27 12:00:00:000 +01:00", romance),
+                new GetOfDaySample("2019-12-31 23:59:59:999 +01:00", "2019-10-29 12:00:00:000 +01:00", romance)
+
+            };
+
+            for (int i = 0; i < samples.Length; i++) {
+
+                var s = samples[i];
+
+                DateTimeOffset result1 = TimeUtils.GetEndOfQuarter(s.Time, s.TimeZone);
+
+                EssentialsTime result2 = new EssentialsTime(s.Time, s.TimeZone).GetEndOfQuarter();
+
+                EssentialsTime result3 = new EssentialsTime(s.Time, s.TimeZone).GetEndOfQuarter(s.TimeZone);
+
+                Assert.AreEqual(s.Expected, result1.ToString(Format), $"Sample at index {i} failed test (DateTimeOffset)");
+
+                Assert.AreEqual(s.Expected, result2.ToString(Format), $"Sample at index {i} failed test (EssentialsTime)");
+
+                Assert.AreEqual(s.Expected, result3.ToString(Format), $"Sample at index {i} failed test (EssentialsTime)");
+
+            }
+
+        }
+
 
         public class GetOfDaySample {
 
diff --git a/src/UnitTestProject1/Time/Time/DateTimeTests.cs b/src/UnitTestProject1/Time/Time/DateTimeTests.cs
index 00ee0c7..dadc846 100644
--- a/src/UnitTestProject1/Time/Time/DateTimeTests.cs
+++ b/src/UnitTestProject1/Time/Time/DateTimeTests.cs
@@ -62,6 +62,67 @@ public void GetEndOfWeek() {
 
         }
 
+        [TestMethod]
+        public void GetStartOfMonth() {
+
+            DateTime time = new DateTime(2023, 1, 22, 12, 0, 0);
+
+            DateTime result = TimeUtils.GetStartOfMonth(time);
+
+            Assert.AreEqual("2023-01-01 00:00:00", result.ToString(_format, CultureInfo.CurrentCulture));
+
+        }
+
+        [TestMethod]
+        public void GetEndOfMonth() {
+
+            DateTime time = new DateTime(2023, 1, 22, 12, 0, 0);
+
+            var result1 = TimeUtils.GetEndOfMonth(time);
+
+            Assert.AreEqual("2023-01-31 23:59:59", result1.ToString(_format, CultureInfo.CurrentCulture));
+
+        }
+
+        [TestMethod]
+        public void GetQuarter() {
+
+            DateTime time1 = new DateTime(2023, 1, 22, 12, 0, 0);
+            DateTime time2 = new DateTime(2023, 6, 5, 12, 0, 0);
+            DateTime time3 = new DateTime(2023, 7, 4, 12, 0, 0);
+
+            int result1 = TimeUtils.GetQuarter(time1);
+            int result2 = TimeUtils.GetQuarter(time2);
+            int result3 = TimeUtils.GetQuarter(time3);
+
+            Assert.AreEqual(1, result1);
+            Assert.AreEqual(2, result2);
+            Assert.AreEqual(3, result3);
+
+        }
+
+        [TestMethod]
+        public void GetStartOfQuarter() {
+
+            DateTime time = new DateTime(2023, 1, 22, 12, 0, 0);
+
+            DateTime result = TimeUtils.GetStartOfQuarter(time);
+
+            Assert.AreEqual("2023-01-01 00:00:00", result.ToString(_format, CultureInfo.CurrentCulture));
+
+        }
+
+        [TestMethod]
+        public void GetEndOfQuarter() {
+
+            DateTime time = new DateTime(2023, 1, 22, 12, 0, 0);
+
+            var result1 = TimeUtils.GetEndOfQuarter(time);
+
+            Assert.AreEqual("2023-03-31 23:59:59", result1.ToString(_format, CultureInfo.CurrentCulture));
+
+        }
+
     }
 
 }
\ No newline at end of file
diff --git a/src/UnitTestProject1/UnitTestProject1.csproj b/src/UnitTestProject1/UnitTestProject1.csproj
index 7fc739c..f953934 100644
--- a/src/UnitTestProject1/UnitTestProject1.csproj
+++ b/src/UnitTestProject1/UnitTestProject1.csproj
@@ -110,7 +110,7 @@
     <Compile Include="Time\Converters\UnixTimeConverterTests.cs" />
     <Compile Include="Time\Converters\EssentialsDateTimeUnixTimeConverterTests.cs" />
     <Compile Include="Time\Converters\EssentialsDateTimeConverterTests.cs" />
-    <Compile Include="Time\DateTimeOffsetTests.cs" />
+    <Compile Include="Time\Time\DateTimeOffsetTests.cs" />
     <Compile Include="Time\EasterDateTests.cs" />
     <Compile Include="Time\Converters\DateTimeUnixTimeConverterTests.cs" />
     <Compile Include="Time\EssentialsDateRangeTests.cs" />