如何在Android中以秒为单位获取UTC偏移 [英] How to get UTC offset in seconds in android

问题描述

我正在尝试在android中获取以秒为单位的UTC偏移量.由于模拟器不断返回0，所以我无法确定自己是否正确执行了操作.

I'm trying to get the UTC offset in seconds in android. Since the emulator keeps returning 0, I can't tell if I'm doing this correctly or not.

    Calendar c=Calendar.getInstance();
        TimeZone tz=c.getTimeZone();
        int offsetFromUtc=tz.getOffset(0)/1000;

当我在tz.getOffset中输入0时，这意味着我只想要距gmt的秒数.让我知道我在做什么是正确的.谢谢

When I put 0 in the tz.getOffset it means I just want the number of seconds from gmt. Let me know if what Im doing is correct. Thanks

推荐答案

时区偏移量在一年中可能会发生变化，也许最常见的原因是夏令时.而不是将0传递给 TimeZone.getOffset()使用当前时间获取当前偏移量，创建一个新的Date并获取其Time值:

Time Zone offsets can change during the year, perhaps the most common reason is Daylight Savings Time. Instead of passing 0 to TimeZone.getOffset() uses the current time to get the current offset, create a new Date and get its Time value:

TimeZone tz = TimeZone.getDefault();
Date now = new Date();
int offsetFromUtc = tz.getOffset(now.getTime()) / 1000;

模拟器默认为UTC，请尝试检查可用的时区进行测试.您还可以通过时区开关来设置时区，查看文档-timezone.

The emulator defaults to UTC, try checking the available timezones to test. Also you can pass a timezone switch to set the timezone, check the documentation for -timezone.

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