自带有Java日期和时间转换字符的纪元以来的毫秒数
要显示自纪元以来的毫秒数，请使用“Q”日期和时间转换说明符。
System.out.printf("\nMilliseconds since epoch = %TQ", d);此后将显示毫秒。
1970-01-01 00:00:00 GMT
示例
import java.util.Date;
public class Demo {
public static void main(String[] args) {
Date d = new Date();
System.out.printf("Nanoseconds = %tN\n", d);
System.out.printf("Seconds since epoch = %ts", d);
System.out.printf("\nMilliseconds since epoch = %TQ", d);
}
}输出结果
Nanoseconds = 050000000 Seconds since epoch = 1543241478 Milliseconds since epoch = 1543241478050
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