dateFromComponents的意外结果： [英] unexpected result of dateFromComponents:

问题描述

以下代码

NSCalendar *cal = [NSCalendar currentCalendar];
[cal setFirstWeekday:2];
[cal setMinimumDaysInFirstWeek:4];

NSDateComponents *comp = [[NSDateComponents alloc] init];
[comp setYear: 2012];
[comp setMonth:3];
[comp setDay: 12];
NSDate *date = [cal dateFromComponents:comp];
NSLog(@"date:%@",date);

日志：

date:2012-03-11 23:00:00 +0000

任何想法，为什么会发生这种情况以及如何避免
Tnx

Any Idea, why this happen and how to avoid Tnx

推荐答案

我假设您在本地使用CET时区。这就是 [NSCalendar currentCalendar] 将用作时区。

I assume you are using the CET time zone locally. This is what the [NSCalendar currentCalendar] will use as a time zone then.

当您转储<$时c $ c> NSDate 使用NSLog，您将以原始UTC格式获取日期。要使用本地格式打印日期，请查看 NSDateFormatter 类，该类具有 timeZone 属性：

When you dump a NSDate with NSLog, you will get the date in its raw UTC form. To print the date using a local format, look into the NSDateFormatter class, which has a timeZone property:

....
NSDate *date = [cal dateFromComponents:comp];
NSDateFormatter* fmt = [[NSDateFormatter alloc] init];
fmt.timeZone = [NSTimeZone defaultTimeZone]; // Probably not required
NSLog(@"date:%@", [fmt stringFromDate:date]);

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