dateFromComponents的意外结果：

本文介绍了dateFromComponents的意外结果：的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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 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]);