将 NSDate 设置为特定日期、时间和时区
我需要将 NSDate 设置为 iPhone 应用程序的特定日期、时间和时区。
下面的示例代码在 iOS 4 上运行良好，因为 setTimeZone 是在 iOS 4 中引入的。如何在不使用 setTimeZone 的情况下轻松将 NSDate 设置为日期、时间和时区，以便它可以在 iOS 3.0 设备上使用？
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:2010];
[comps setMonth:8];
[comps setDay:24];
[comps setHour:17];
[comps setMinute:5];
[comps setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"] ];
NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *referenceTime = [cal dateFromComponents:comps];
我猜这应该很简单，但不知何故 NSDate、组件和日历和我不是好朋友......
I need to set a NSDate to a specific date, time and timezone for an iPhone App.
The example code below works fine on iOS 4 as the setTimeZone was introduced with iOS 4. How could I easily set a NSDate to a date, time and timezone without using setTimeZone so it can be used on iOS 3.0 devices?
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:2010];
[comps setMonth:8];
[comps setDay:24];
[comps setHour:17];
[comps setMinute:5];
[comps setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"] ];
NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *referenceTime = [cal dateFromComponents:comps];
Guess this should be simple, but somehow NSDate, components and calendars and I are not good friends...
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我想知道您是否可以在用于从
NSDateComponents创建NSDate的NSCalendar对象上设置时区。我没有尝试过，也不知道它是否有效，但可能值得一试。I wonder if you could set the time zone on the
NSCalendarobject that you use to create theNSDatefrom theNSDateComponents. I haven't tried this and don't know if it'll work, but it's probably worth a try.NDate 本身没有时区的概念。它们基本上是自 GMT 某个任意日期以来的秒数。因此，您不能给他们一个时区。如果时区很重要，您将需要跟踪时间和时区。
NDates have no concept of time zones in and of themselves. They're basically seconds since a certain arbitrary date at GMT. As such, you can't give them a time zone. If time zone is important, you'll need to track both the time and the time zone.