dotnet/Library/Vit/Vit.Core/Test/Vit.Core.MsTest/Extensions/TimeStamp_Extensions_Test.cs

@@ -0,0 +1,28 @@
+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Vit.Extensions;
+
+namespace Vit.Core.MsTest.Extensions
+{
+
+    [TestClass]
+    public class TimeStamp_Extensions_Test
+    {
+        [TestMethod]
+        public void Test()
+        {
+            var time = "2021-01-01 12:00:00.123";     
+            
+            var timestamp = DateTime.Parse(time).ToTimeStamp();          
+
+            Assert.AreEqual(1609502400123, timestamp);
+
+            Assert.AreEqual(time, timestamp.TimeStampToDateTime().ToString("yyyy-MM-dd HH:mm:ss.fff"));        
+
+        }
+
+
+         
+
+    }
+}

dotnet/Library/Vit/Vit.Core/Vit.Core/Extensions/TimeStamp_Extensions.cs

@@ -0,0 +1,75 @@
+using System;
+
+namespace Vit.Extensions
+{
+    public static class TimeStamp_Extensions
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="AccurateToMilliseconds">是否精确到毫秒</param>
+        /// <returns>返回一个长整数时间戳</returns>
+        public static long ToTimeStamp(this DateTime time,bool AccurateToMilliseconds = true)
+        {
+            if (AccurateToMilliseconds)
+            {
+                // 使用当前时间计时周期数（636662920472315179）减去1970年01月01日计时周期数（621355968000000000）除去（删掉）后面4位计数（后四位计时单位小于毫秒，快到不要不要）再取整（去小数点）。
+                //备注：DateTime.Now.ToUniversalTime不能缩写成DateTime.Now.Ticks，会有好几个小时的误差。
+                //621355968000000000计算方法 long ticks = (new DateTime(1970, 1, 1, 8, 0, 0)).ToUniversalTime().Ticks;
+                return (time.Ticks - 621355968000000000) / 10000;
+            }
+            else
+            {
+                //上面是精确到毫秒，需要在最后除去（10000），这里只精确到秒，只要在10000后面加三个0即可（1秒等于1000毫米）。
+                return (time.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
+            }
+        }
+
+
+       
+        /// <summary>
+        /// 时间戳转换为时间
+        /// </summary>
+        /// <param name="TimeStamp">时间戳</param>
+        /// <param name="AccurateToMilliseconds">是否精确到毫秒</param>
+        /// <returns>返回一个日期时间</returns>
+        public static DateTime TimeStampToDateTime(this long TimeStamp, bool AccurateToMilliseconds = true)
+        {           
+            if (AccurateToMilliseconds)
+            {
+                return startTime.AddTicks(TimeStamp * 10000);
+            }
+            else
+            {
+                return startTime.AddTicks(TimeStamp * 10000000);
+            }
+        }
+        /// <summary>
+        /// 时间戳的起始时间
+        /// </summary>
+        public static System.DateTime startTime = new System.DateTime(1970, 1, 1);
+
+
+        /// <summary>
+        /// 时间戳转换为时间(使用本地时区)
+        /// </summary>
+        /// <param name="TimeStamp">时间戳</param>
+        /// <param name="AccurateToMilliseconds">是否精确到毫秒</param>
+        /// <returns>返回一个日期时间</returns>
+        public static DateTime TimeStampToLocalDateTime(this long TimeStamp, bool AccurateToMilliseconds = true)
+        {
+            if (AccurateToMilliseconds)
+            {
+                return startTimeLocal.AddTicks(TimeStamp * 10000);
+            }
+            else
+            {
+                return startTimeLocal.AddTicks(TimeStamp * 10000000);
+            }
+        }
+        /// <summary>
+        /// 时间戳的起始时间(使用本地时区)
+        /// </summary>
+        public static System.DateTime startTimeLocal = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); // 当地时区
+    }
+}