NSDate/NSDateFormatter在iPhone iOS 4.3上返回GMT [英] NSDate / NSDateFormatter returning GMT on iPhone iOS 4.3

问题描述

为什么这段代码会给我格林尼治标准时间(GMT)? (我在美国山区时间)

Why would this code be giving me GMT? (I am in US Mountain Time)

NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init]  autorelease];
[dateFormatter setDateStyle:NSDateFormatterLongStyle];
[dateFormatter setTimeStyle:NSDateFormatterLongStyle];
[dateFormatter setLocale:[NSLocale currentLocale]];     

NSDate *now = [NSDate date];
NSString *storeTime = [dateFormatter stringFromDate:now];

推荐答案

NSDate代表具体的时间点，与时区无关.换句话说，NSDate没有时区.时区仅在您想要向用户显示日期时才相关.因此，山区时间的9:30 pm是(格林尼治标准时间)上午3:30(+1天)(假设时差为6小时).

An NSDate represents a concrete point in time, regardless of the timezone. Put another way, an NSDate does not have a timezone. Timezones are only relevant when you want to display the date to the user. So 9:30pm in Mountain Time is 3:30am (+1 day) in GMT (assuming a 6 hour time difference).

NSDate由于没有时区，因此在生成人类可读版本时必须选择一个作为其-description返回.为简单起见，它总是返回以GMT时区为格式的日期.如果希望将日期格式设置为其他时区，则可以设置NSDateFormatter的-timezone属性，然后使用-stringFromDate:方法将日期转换为字符串.

NSDate, since it does not have a timezone, must pick one when producing a human-readable version to return as its -description. To make things simple, it always returns a date formatted in the GMT time zone. If you would like the date formatted to be in a different timezone, you can set the -timezone property of an NSDateFormatter, and then convert the date into a string using the -stringFromDate: method.

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