将本地时间戳转换为UTC时间戳 [英] Converting local timestamp to UTC timestamp in Java
本文介绍了将本地时间戳转换为UTC时间戳的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个毫秒从本地时代的时间戳,我想转换成一个毫秒从UTC-epoch时间戳。通过文档快速浏览,它看起来像这样的工作:
I have a milliseconds-since-local-epoch timestamp that I'd like to convert into a milliseconds-since-UTC-epoch timestamp. From a quick glance through the docs it looks like something like this would work:
int offset = TimeZone.getDefault().getRawOffset();
long newTime = oldTime - offset;
有没有更好的方法?
推荐答案
使用日历
获取本地Epoch的偏移量,然后将其添加到本地时间戳。
Use a Calendar
to get what the offset was at the local Epoch, then add that to the local-epoch timestamp.
public static long getLocalToUtcDelta() {
Calendar local = Calendar.getInstance();
local.clear();
local.set(1970, Calendar.JANUARY, 1, 0, 0, 0);
return local.getTimeInMillis();
}
public static long converLocalTimeToUtcTime(long timeSinceLocalEpoch) {
return timeSinceLocalEpoch + getLocalToUtcDelta();
}
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