如何使用 Java 找到从午夜开始经过的秒数? [英] How can I find the amount of seconds passed from the midnight with Java?

问题描述

我需要一个函数来告诉我从午夜过去了多少秒.我目前正在使用 System.currentTimeMillis() 但它给了我类似 UNIX 的时间戳.

I need a function that gives me how many seconds passed from the midnight. I am currently using System.currentTimeMillis() but it gives me the UNIX like timestamp.

如果我也能得到毫秒，那对我来说是一个奖励.

It would be a bonus for me if I could get the milliseconds too.

推荐答案

如果您使用 Java >= 8，这很容易做到:

If you're using Java >= 8, this is easily done :

ZonedDateTime nowZoned = ZonedDateTime.now();
Instant midnight = nowZoned.toLocalDate().atStartOfDay(nowZoned.getZone()).toInstant();
Duration duration = Duration.between(midnight, Instant.now());
long seconds = duration.getSeconds();

如果您使用的是 Java 7 或更低版本，则必须通过 Calendar 从午夜开始获取日期，然后减去.

If you're using Java 7 or less, you have to get the date from midnight via Calendar, and then substract.

Calendar c = Calendar.getInstance();
long now = c.getTimeInMillis();
c.set(Calendar.HOUR_OF_DAY, 0);
c.set(Calendar.MINUTE, 0);
c.set(Calendar.SECOND, 0);
c.set(Calendar.MILLISECOND, 0);
long passed = now - c.getTimeInMillis();
long secondsPassed = passed / 1000;

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