NSCalendar dateFromComponents：GMT 时区而不是 systemTimeZone
此代码
NSCalendar *calendar =[NSCalendar currentCalendar];
[gregorian setTimeZone:tz];
NSLog(@"%@", [gregorian timeZone]);
NSDateComponents *comp = [gregorian components:(NSYearCalendarUnit | NSMonthCalendarUnit) fromDate:[NSDate date]];
[comp setDay:info.day];
[comp setMonth:info.month];
[comp setYear:info.year];
[comp setHour:info.hour];
[comp setMinute:info.minute];
[comp setSecond:info.second];
[comp setTimeZone:tz];
NSLog(@"%@", [comp timeZone]);
NSLog(@"%@", [gregorian dateFromComponents:comp]);
在控制台中显示以下内容：
Europe/Moscow (MSKS) offset 14400 (Daylight)
Europe/Moscow (MSKS) offset 14400 (Daylight)
2011-08-31 20:00:00 +0000
因此，日历和组件的时区指定正确，但 [gregorian dateFromComponents:comp] 返回时区 (GMT) 错误的 NSDate 值。
我需要更正什么才能获得正确的时区？
This code
NSCalendar *calendar =[NSCalendar currentCalendar];
[gregorian setTimeZone:tz];
NSLog(@"%@", [gregorian timeZone]);
NSDateComponents *comp = [gregorian components:(NSYearCalendarUnit | NSMonthCalendarUnit) fromDate:[NSDate date]];
[comp setDay:info.day];
[comp setMonth:info.month];
[comp setYear:info.year];
[comp setHour:info.hour];
[comp setMinute:info.minute];
[comp setSecond:info.second];
[comp setTimeZone:tz];
NSLog(@"%@", [comp timeZone]);
NSLog(@"%@", [gregorian dateFromComponents:comp]);
shows the following in console:
Europe/Moscow (MSKS) offset 14400 (Daylight)
Europe/Moscow (MSKS) offset 14400 (Daylight)
2011-08-31 20:00:00 +0000
So, the timezone for calendar and components is specified correctly, but [gregorian dateFromComponents:comp] returns NSDate value with wrong time zone (GMT).
What do I need to correct to get proper timezone?
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您看到的输出是完全正常的。如果直接 NSLog 一个
NSDate对象，您将得到description方法返回的任何内容，这是日期的 GMT 表示（但这不是一成不变的）。NSDate对象不受时区的限制。NSDate表示从参考日期开始测量的绝对时刻。例如，在撰写本文时，当前日期类似于337035053.199801（自参考日期以来的秒数），可以表示为2011-09-06 20:50:53 GMT< /code> 或2011-09-06 22:50:53 CEST。两者都是同一日期的不同人类可读表示。总之，您需要什么才能获得正确的时区？您需要使用
NSDateFormatter来获取您喜欢的任何时区的NSDate的字符串表示形式。The output you are seeing is perfectly normal. If you NSLog a
NSDateobject directly, you will get whatever thedescriptionmethod returns, which is the GMT representation of the date (but that is not carved in stone).NSDateobjects are not subject to timezones. ANSDaterepresents an absolute instant in time measured from a reference date. For example, at the time of writing, the current date is something like337035053.199801(seconds since reference date), which can be represented as2011-09-06 20:50:53 GMTor2011-09-06 22:50:53 CEST. Both are different human readable representations of the same date.In conclusion, what do you need to get the proper timezone? You need to use
NSDateFormatterto get a string representation of yourNSDatein any timezone you like.这个问题经常出现，答案是使用
NSDateFormatter以获得日期格式所需的输出。目前，它始终打印 GMT 时区。以下是NSDate：This question comes up quite often and the answer is to use an
NSDateFormatterto get the desired output for the date format. Currently it is always printed with the GMT timezone. Here is the discussion for the documentation forNSDate: