将 UTC 日期转换为其他时区

问题描述

我正在使用这种方法将 UTC 时间转换为另一个时区:

I'm converting a UTC time to another timezone, using this method:

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date parsed = format.parse("2011-03-01 15:10:37");
TimeZone tz = TimeZone.getTimeZone("America/Chicago");
format.setTimeZone(tz);

String result = format.format(parsed);

所以输入是 2011-03-01 15:10:37 但是这个(结果的值)的输出是 2011-03-01 05:40:37代码>.虽然它似乎关闭，但根据 此链接，它应该是 2011-03-01 09:10:37.

So the input is 2011-03-01 15:10:37 but the output of this (value of result) is 2011-03-01 05:40:37. While it seems off, and according to this link, it should be 2011-03-01 09:10:37.

我做错了什么?

推荐答案

原来代码几乎是正确的，我没有考虑到在解析 String 时得到一个Date 对象最初，它使用默认系统 TimeZone，所以源日期不是我预期的 UTC.

It turns out the code was almost correct, what I didn't take into account was that when parsing the String to get a Date object initially, it uses default system TimeZone, so the source date was not in UTC as I expected.

诀窍是在将日期解析为 UTC 时设置时区，然后将其设置为目标 TimeZone.像这样的:

The trick was to set the timezone when parsing the date to UTC and then set it to destination TimeZone. Something like this:

SimpleDateFormat sourceFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sourceFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
Date parsed = sourceFormat.parse("2011-03-01 15:10:37"); // => Date is in UTC now

TimeZone tz = TimeZone.getTimeZone("America/Chicago");
SimpleDateFormat destFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
destFormat.setTimeZone(tz);

String result = destFormat.format(parsed);

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