转移.net core 3.1，为.NET 5做准备

Infrastructure/Extensions/DateTimeExtension.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace Infrastructure.Extensions
+{
+  public static class DateTimeExtension
+  {
+    /// <summary>
+    /// 实现由C# 的时间到 Javascript 的时间的转换
+    /// returns the number of milliseconds since Jan 1, 1970 (useful for converting C# dates to JS dates)  
+    /// </summary>
+    /// <param name="dt"></param>
+    /// <returns></returns>
+    public static double UnixTicks(this DateTime dt)
+    {
+      DateTime d1 = new DateTime(1970, 1, 1); 
+      DateTime d2 = dt.AddHours(8).ToUniversalTime(); 
+      TimeSpan ts = new TimeSpan(d2.Ticks - d1.Ticks);
+      return ts.TotalMilliseconds;
+    }
+
+    /// <summary>
+    /// 将毫秒值转成 C#  DateTime 类型
+    /// </summary>
+    /// <param name="time"></param>
+    /// <returns></returns>
+    public static DateTime ConvertTime(this long time)
+    {
+      DateTime timeStamp = new DateTime(1970, 1, 1); //得到1970年的时间戳    
+      long t = (time + 8 * 60 * 60) * 10000000 + timeStamp.Ticks;
+      DateTime dt = new DateTime(t);
+      return dt;
+    }
+  }
+}