Java中的 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 纪元以来的秒数。该方法将此 ChronoZonedDateTime 与作为参数传递的偏移量相结合,以计算纪元秒值,即从 1970-01-01T00:00:00Z 开始经过的秒数。纪元之后时间线上的瞬间是正的,更早的是负的。
句法:
default long toEpochSecond()
参数:此方法不接受任何参数。
返回值:此方法返回long ,即自1970-01-01T00:00:00Z epoch 以来的秒数,可能为负数。
下面的程序说明了 toEpochSecond() 方法:
方案一:
// 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
方案二:
// 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: https://docs.oracle.com/javase/9/docs/api/ Java/time/chrono/ChronoZonedDateTime.html#toEpochSecond–