C＃中的DateTimeOffset.ToUnixTimeMilliseconds()方法

DateTimeOffset.ToUnixTimeMilliseconds方法用于返回自1970-01-01T00：00：00.000Z以来经过的毫秒数。此方法将为1970-01-01T00：00：00Z之前的日期和时间值返回负值。

Syntax: public long ToUnixTimeMilliseconds ();

Return Value: This method returns the number of milliseconds that have elapsed since 1970-01-01T00:00:00.000Z.

下面的程序说明了DateTimeOffset.ToUnixTimeMilliseconds()方法的用法：

范例1：

// C# program to demonstrate the
// DateTimeOffset.ToUnixTimeMilliseconds()
// Method
using System;
using System.Globalization;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // creating object of  DateTimeOffset
        DateTimeOffset offset = new DateTimeOffset(2007,
                6, 1, 7, 55, 0, new TimeSpan(-5, 0, 0));
  
        // Returns the number of milliseconds
        // instance using ToUnixTimeMilliseconds() method
        long value = offset.ToUnixTimeMilliseconds();
  
        // Display the time
        Console.WriteLine("Returns the number of"+
                    " milliseconds : {0}", value);
    }
}

输出：

Returns the number of milliseconds : 1180702500000

范例2：

// C# program to demonstrate the
// DateTimeOffset.ToUnixTimeMilliseconds()
// Method
using System;
using System.Globalization;
  
class GFG {
  
    // Main Method
    public static void Main()
    {
        // Creating object of  DateTimeOffset
        DateTimeOffset offset = new DateTimeOffset(1960,
                6, 1, 7, 55, 0, new TimeSpan(-5, 0, 0));
  
        // Returns the number of milliseconds
        // instance using ToUnixTimeMilliseconds() method
        long value = offset.ToUnixTimeMilliseconds();
  
        // Display the time
        Console.WriteLine("Returns the number "+
                "of milliseconds : {0}", value);
    }
}

输出：

Returns the number of milliseconds : -302439900000

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.datetimeoffset.tounixtimemilliseconds?view=netframework-4.7.2