确实System.currentTimeMillis的（）的返回UTC时间？ [英] does System.currentTimeMillis() return UTC time?

问题描述

我想在米利斯当前UTC时间。我搜索谷歌并得到了一些答案，System.currentTimeMillis的（）不返回UTC时间。但事实并非如此。如果我下面的：

I want to get the current UTC time in millis. I searched google and got some answers that System.currentTimeMillis() does returns UTC time. but it does not. If I do following:

long t1 = System.currentTimeMillis();
long t2 = new Date().getTime();
long t3 = Calendar.getInstance().getTimeInMillis();

这三个时间几乎相同（不同的是，由于电话毫秒）。

all three times are almost same ( difference is in milli seconds due to calls ).

t1 = 1372060916
t2 = 1372060917
t3 = 1372060918

和这一次是不是UTC时间，而不是这是我的时区的时间。我怎样才能在Android上的当前UTC时间？

and this time is not the UTC time instead this is my timezone time. How can i get the current UTC time in android?

推荐答案

这三种，你已经证明会给自Unix时代，这是一个固定的时间点的毫秒数的线条，不影响当地时区。

All three of the lines you've shown will give the number of milliseconds since the unix epoch, which is a fixed point in time, not affected by your local time zone.

您说：这一次是不是UTC时间 - 我怀疑你实际上已经诊断为不正确。我会建议使用 epochconverter.com 这一点。例如，在你的例子：

You say "this time is not the UTC time" - I suspect you've actually diagnosed that incorrectly. I would suggest using epochconverter.com for this. For example, in your example:

1372060916 = Mon, 24 Jun 2013 08:01:56 GMT

我们不知道你什么时候产生的价值，但除非它是的实际上的在上午8:01 UTC，它与您的系统时钟出现问题。

We don't know when you generated that value, but unless it was actually at 8:01am UTC, it's a problem with your system clock.

无论是 System.currentTimeMillis的，也没有在日期值本身受时区。但是，你应该知道，与Date.toString（）的确实的使用本地时区，这会误导很多开发商以为一个日期本质上是同一个时区相关联 - 它不是，它只是时间上的某个瞬间，没有相关的时区，甚至日历系统

Neither System.currentTimeMillis nor the value within a Date itself are affected by time zone. However, you should be aware that Date.toString() does use the local time zone, which misleads many developers into thinking that a Date is inherently associated with a time zone - it's not, it's just an instant in time, without an associated time zone or even calendar system.

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