优化更新代码，添加界面功能并整合

WPFluent/Extensions/DateTimeExtensions.cs

@@ -0,0 +1,37 @@
+
+
+
+namespace WPFluent.Extensions;
+
+/// <summary>
+/// A collection of several extensions to the <see cref="DateTime"/> class.
+/// </summary>
+public static class DateTimeExtensions
+{
+    /// <summary>
+    /// Gets the number of microseconds that have elapsed since the Unix epoch, excluding leap seconds. The Unix epoch
+    /// is 00:00:00 UTC on 1 January 1970.
+    /// </summary>
+    public static long GetMicroTimestamp(this DateTime dateTime)
+    {
+        // Should be 10^-6
+        return dateTime.Subtract(new DateTime(1970, 1, 1)).Ticks / (TimeSpan.TicksPerMillisecond / 1000);
+    }
+
+    /// <summary>
+    /// Gets the number of milliseconds that have elapsed since the Unix epoch, excluding leap seconds. The Unix epoch
+    /// is 00:00:00 UTC on 1 January 1970.
+    /// </summary>
+    public static long GetMillisTimestamp(this DateTime dateTime)
+    {
+        // Should be 10^-3
+        return (long)dateTime.Subtract(new DateTime(1970, 1, 1)).TotalMilliseconds;
+    }
+
+    /// <summary>
+    /// Gets the number of seconds that have elapsed since the Unix epoch, excluding leap seconds. The Unix epoch is
+    /// 00:00:00 UTC on 1 January 1970.
+    /// </summary>
+    public static long GetTimestamp(this DateTime dateTime)
+    { return (long)dateTime.Subtract(new DateTime(1970, 1, 1)).TotalSeconds; }
+}