NsDate格式化程序从String给出错误的日期 [英] NsDate formatter giving wrong Date from String

问题描述

我有以下代码，它接受NSString并返回NSDate。我已经从一个完全正常运行的项目中复制了这个代码 - 但是有些如何给我错误的输出

I have the following code which takes a NSString and returns NSDate. I have copied this code from a project in which it runs perfectly fine - but some how this gives me the wrong output

- (NSDate *)dateFromString:(NSString *)date
{
    static NSDateFormatter *dateFormatter;
    if (!dateFormatter)
    {
        dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"dd-MM-yyyy"];
    }

    NSLog(@"Date: %@ Formatted: %@",date,[dateFormatter dateFromString:date]);

    return [dateFormatter dateFromString:date];
}

，输出来自日志：

Date: 07-01-2014 Formatted: 2014-01-06 18:30:00 +0000
Date: 24-01-2014 Formatted: 2014-01-23 18:30:00 +0000
Date: 06-01-2014 Formatted: 2014-01-05 18:30:00 +0000
Date: 15-01-2014 Formatted: 2014-01-14 18:30:00 +0000
Date: 22-01-2014 Formatted: 2014-01-21 18:30:00 +0000
Date: 31-01-2014 Formatted: 2014-01-30 18:30:00 +0000
Date: 14-01-2014 Formatted: 2014-01-13 18:30:00 +0000
Date: 30-01-2014 Formatted: 2014-01-29 18:30:00 +0000

奇怪的是，它也改变了日期.. !!
任何帮助...... !!!

In a weird sense it is also changing the Date..!! Any help...!!!

推荐答案

结果是格林威治标准时间输出结果 - 即如果你距格林威治标准时间5：3小时。

The results are formated for GMT output - i.e. if you are 5:3 hours away from GMT.

如果您希望在该时区内返回格式化日期，则需要指定时区:(即+ 00表示的含义）

You need to specify a timezone if you want the date formated to be returned in that timezone: (that is what the +0000 means)

- (NSDate *)dateFromString:(NSString *)date
{
    static NSDateFormatter *dateFormatter;
    if (!dateFormatter)
    {
        dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]];
        [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
        [dateFormatter setDateFormat:@"dd-MM-yyyy"];
    }

    NSLog(@"Date: %@ Formatted: %@",date,[dateFormatter dateFromString:date]);

    return [dateFormatter dateFromString:date];
}

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