NSDateFormatter 时区缩写 [英] NSDateFormatter time zone abbreviation

问题描述

我需要识别日期字符串，例如 Tue Aug 13 17:29:20 MSK 2013.而且，据我所知，要做到这一点，我需要在 NSDateFormmater 中使用V"符号，但它只能识别 GMT+04:00 之类的时区.还有其他解析时区缩写的方法吗?

I need to recognize date strings like Tue Aug 13 17:29:20 MSK 2013. And, as I know, to do that I need to use 'V' symbol in NSDateFormmater, but it only recognizes GMT+04:00 like time zones. Is there any other way to parse time zone abbreviation?

代码如下:

  NSDateFormatter *dft = [[NSDateFormatter alloc] init];
  [dft setDateFormat:@"EEE MMM dd HH:mm:ss V yyyy"];
  NSLog(@"%@", [dft stringFromDate:[NSDate date]]);
  NSLog(@"%@", [dft dateFromString:@"Tue Aug 13 17:29:20 MSK 2013"]);

输出:

Tue Aug 13 17:37:41 GMT+04:00 2013
(null)

使用 NSLog(@"%@", [dft dateFromString:@"Tue Aug 13 17:29:20 GMT+04.00 2013"]) 输出很好.

推荐答案

根据 http://www.openradar.me/9944011，Apple 在 Lion/iOS 5 时代的某个时间更新了 NSDateFormatter 所依赖的 ICU 库.并且它不再处理大多数 3 个字母的时区，特别是MSK"(莫斯科时间)，因为它们是不明确的，只有在为语言环境设置了cu"标志时才使用它们.

according to http://www.openradar.me/9944011, Apple updated the ICU library which NSDateFormatter depends on, some time during the Lion/iOS 5 era. and it no longer handles most 3-letter timezones like "MSK" in particular (Moscow Time) because they're ambiguous, they only are used if the "cu" flag is set for the locale.

这意味着您可以处理它.例如:

Which means that you get to handle it. For example with this:

 NSString *threeLetterZone = [[dateString componentsSeparatedByString:@" "] objectAtIndex:4];
 NSTimeZone *timeZone = [NSTimeZone timeZoneWithAbbreviation:threeLetterZone];
 if (timeZone) 
 {
            NSString *gmtTime = [dateString stringByReplacingOccurrencesOfString:threeLetterZone withString:@"GMT"];
            date = [[pivotalDateFormatter dateFromString:gmtTime] dateByAddingTimeInterval:-timeZone.secondsFromGMT];
 }

基于此代码

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