Java ChronoLocalDateTime toEpochSecond()方法及实例

ChronoLocalDateTime 类的 toEpochSecond() 方法用于将此ChronoLocalDateTime转换为自1970-01-01T00:00:00Z这个纪元以来的秒数。该方法将ChronoLocalDateTime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，较早的为负。

语法

default long toEpochSecond(ZoneOffset offset)

参数： 该方法接受一个参数 offset ，即区域偏移。

返回值： 该方法返回 long ，即从1970-01-01T00:00:00Z开始的秒数，可能为负数。

以下程序说明了toEpochSecond()方法。

程序1 :

// Java program to demonstrate
// ChronoLocalDateTime.toEpochSecond() method
  
import java.time.*;
import java.time.chrono.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create ChronoLocalDateTime object
        ChronoLocalDateTime time
            = LocalDateTime
                  .parse("2019-12-31T19:15:30");
  
        // print ChronoLocalDateTime
        System.out.println("ChronoLocalDateTime: "
                           + time);
  
        // create ZoneId
        ZoneOffset zone = ZoneOffset.of("Z");
  
        // print ZoneId
        System.out.println("Passed ZoneOffset: "
                           + zone);
  
        // print result
        System.out.println("Epoch Second: "
                           + time.toEpochSecond(zone));
    }
}

输出:

ChronoLocalDateTime: 2019-12-31T19:15:30
Passed ZoneOffset: Z
Epoch Second: 1577819730

程序2

// Java program to demonstrate
// ChronoLocalDateTime.toEpochSecond() method
  
import java.time.*;
import java.time.chrono.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create ChronoLocalDateTime object
        ChronoLocalDateTime time
            = LocalDateTime.parse(
                "2018-10-25T23:12:31.123");
  
        // print ChronoLocalDateTime
        System.out.println("ChronoLocalDateTime: "
                           + time);
  
        // create ZoneId
        ZoneOffset zone = ZoneOffset.of("Z");
  
        // print ZoneId
        System.out.println("Passed ZoneOffset: "
                           + zone);
  
        // print result
        System.out.println("Epoch Second: "
                           + time.toEpochSecond(zone));
    }
}

输出:

ChronoLocalDateTime: 2018-10-25T23:12:31.123
Passed ZoneOffset: Z
Epoch Second: 1540509151

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