Java中ChronoZonedDateTime toEpochSecond()方法及示例

ChronoZonedDateTime 接口的 toEpochSecond() 方法用于将此ChronoZonedDateTime转换为自1970-01-01T00:00:00Z这个纪元以来的秒数。该方法将这个ChronoZonedDateTime与作为参数传递的偏移量结合起来，计算出纪元秒值，即从1970-01-01T00:00:00Z开始的已过秒数。时间轴上的纪元后的时刻为正值，较早的时刻为负值。

语法

default long toEpochSecond()

参数： 本方法不接受任何参数。

返回值： 该方法的返回值为1970-01-01T00:00:00Z以来的秒数，可能为负值。

下面的程序说明了toEpochSecond()方法。

程序1 :

// Java program to demonstrate
// ChronoZonedDateTime.toEpochSecond() method
  
import java.time.*;
import java.time.chrono.*;
import java.time.chrono.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create ChronoZonedDateTime object
        ChronoZonedDateTime time
            = ZonedDateTime
                  .parse(
                      "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");
  
        // print ChronoZonedDateTime
        System.out.println("ChronoZonedDateTime: "
                           + time);
  
        // print result
        System.out.println("Epoch Second: "
                           + time.toEpochSecond());
    }
}

输出:

ChronoZonedDateTime: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
Epoch Second: 1544104272

程序2

// Java program to demonstrate
// ChronoZonedDateTime.toEpochSecond() method
  
import java.time.*;
import java.time.chrono.*;
import java.time.chrono.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create ChronoZonedDateTime object
        ChronoZonedDateTime time
            = ZonedDateTime.parse(
                "1918-10-25T23:12:38.543+02:00[Europe/Paris]");
  
        // print ChronoZonedDateTime
        System.out.println("ChronoZonedDateTime: "
                           + time);
  
        // print result
        System.out.println("Epoch Second: "
                           + time.toEpochSecond());
    }
}

输出:

ChronoZonedDateTime: 1918-10-25T23:12:38.543Z[Europe/Paris]
Epoch Second: -1615250842

参考资料: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/ChronoZonedDateTime.html#toEpochSecond-