diff --git a/DateTimeStudy.XUnitTest/DateTimeExtensionsTest.cs b/DateTimeStudy.XUnitTest/DateTimeExtensionsTest.cs
new file mode 100644
index 0000000..2c817cb
--- /dev/null
+++ b/DateTimeStudy.XUnitTest/DateTimeExtensionsTest.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Xunit;
+
+using DateTimeStudy;
+
+namespace DateTimeStudy.XUnitTest
+{
+    public class DateTimeExtensionsTest
+    {
+        [Fact]
+        public void Test()
+        {
+            var aa = DateTime.Now.ToUtcTimestamp();
+            var cc = aa.ToLocalTime();
+        }
+    }
+}
diff --git a/DateTimeStudy/DateTimeExtensions.cs b/DateTimeStudy/DateTimeExtensions.cs
index 22de52f..3b43e80 100644
--- a/DateTimeStudy/DateTimeExtensions.cs
+++ b/DateTimeStudy/DateTimeExtensions.cs
@@ -7,7 +7,27 @@ namespace DateTimeStudy
     /// <summary>
     /// DateTime扩展类
     /// </summary>
-    public class DateTimeExtensions
+    public static class DateTimeExtensions
     {
+        /// <summary>
+        /// 以毫秒为单位的UTC时间戳
+        /// </summary>
+        public static long ToUtcTimestamp(this DateTime sourceDate)
+        {
+            var utcTimeStart = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+            return (sourceDate - utcTimeStart).Ticks;
+        }
+
+        /// <summary>
+        /// 毫秒单位UTC时间戳转当地时间
+        /// </summary>
+        public static DateTime ToLocalTime(this long utcTimestamp)
+        {
+            DateTime utcTimeStart = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+
+            var timeSpan = new TimeSpan(utcTimestamp);
+
+            return utcTimeStart.Add(timeSpan).ToLocalTime();
+        }
     }
 }
diff --git a/DateTimeStudy/DateTimeStudy.cs b/DateTimeStudy/DateTimeStudy.cs
index 42258cc..24890d2 100644
--- a/DateTimeStudy/DateTimeStudy.cs
+++ b/DateTimeStudy/DateTimeStudy.cs
@@ -116,8 +116,7 @@ namespace DateTimeStudy
         }
 
         /// <summary>
-        /// 获取当前时间的UTC时间戳(
-        /// 单位：毫秒
+        /// 毫秒单位UTC时间戳转当地时间
         /// </summary>
         public static DateTime UtcTimestamp2DateTime(long utcTimestamp)
         {