如何将时区偏移量设为 ±hh:mm? [英] How to get timezone offset as ±hh:mm?

问题描述

我可以从 GMT 获取偏移秒数:TimeZone.current.secondsFromGMT().

I can get the offset seconds from GMT with this: TimeZone.current.secondsFromGMT().

但是，如何获得±hh:mm的格式?

However, how do I get the format as ±hh:mm?

推荐答案

一些整数运算来获得以小时为单位的偏移量和分钟:

Some integer arithmetic to obtain the offset in hours and minutes:

let seconds = TimeZone.current.secondsFromGMT()

let hours = seconds/3600
let minutes = abs(seconds/60) % 60

格式化打印:

let tz = String(format: "%+.2d:%.2d", hours, minutes)
print(tz) // "+01:00" 

%.2d 打印一个整数(至少)两个十进制数字(和前导如有必要为零).%+.2d 是相同的，但有一个领先的 + 符号非负数.

%.2d prints an integer with (at least) two decimal digits (and leading zero if necessary). %+.2d is the same but with a leading + sign for non-negative numbers.

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