Java经典实例：纪元秒和本地日期时间互换

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;

/**
* Created by Frank
*/
public class CurrentDatetime {
public static void main(String[] args) {
// 纪元秒和本地日期时间互换
Instant epochSec = Instant.ofEpochSecond(1000000000L);
ZoneId zId = ZoneId.systemDefault();
ZonedDateTime then = ZonedDateTime.ofInstant(epochSec, zId);
System.out.println("The epoch was a billion seconds old on " + then);
}
}

The epoch was a billion seconds old on 2001-09-09T09:46:40+08:00[Asia/Shanghai]