NSDateFormatter 按年和月格式化日期

发布于 2024-12-26 18:47:36 字数 333 浏览 2 评论 0原文

我尝试将 NSDateFormatter 设置为年份，如下所示：

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy"];
NSLog(@"**> %@",[dateFormatter dateFromString:@"2012"]);
[dateFormatter release];

但它打印： **> 2011-12-31 22:00:00 +0000

也许有人可以帮助我解决这个问题

原文

I tried to set NSDateFormatter for year, like this:

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy"];
NSLog(@"**> %@",[dateFormatter dateFromString:@"2012"]);
[dateFormatter release];

But it prints: **> 2011-12-31 22:00:00 +0000

Maybe someone could help me about this

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月亮坠入山谷 2025-01-02 18:47:36

这与 UTC (GMT) 和您的时区（您可能处于 GMT+2）之间的时区差异有关。 NSDate 默认采用 UTC。这就是为什么 [NSDate date] 可能会偏离当地时间。

以下代码应输出 Jan 1, 2012：

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy zzz"];
NSLog(@"**> %@",[dateFormatter dateFromString:@"2012 GMT"]);
[dateFormatter release];

或

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
[dateFormatter setDateFormat:@"yyyy"];
NSLog(@"NSDate : %@",[dateFormatter dateFromString:@"2012"]);
[dateFormatter release];

This has to do with the timezone difference between UTC (GMT) and your time zone (you're probably in GMT+2). NSDate is in UTC by default. That's why [NSDate date] can deviate from the local time.

The following code should output Jan 1, 2012:

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy zzz"];
NSLog(@"**> %@",[dateFormatter dateFromString:@"2012 GMT"]);
[dateFormatter release];

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"UTC"]];
[dateFormatter setDateFormat:@"yyyy"];
NSLog(@"NSDate : %@",[dateFormatter dateFromString:@"2012"]);
[dateFormatter release];

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吹泡泡o 2025-01-02 18:47:36

希望您来自 +02:00 时区。由于 NSDate 始终给出 GMT 时区的时间，因此它不会打印 2012-01-01 00:00:00 +0000 ，而是打印上述值，即 GMT 时区的时间。

编辑：

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
[dateFormatter setDateFormat:@"yyyy"];
NSLog(@"NSDate : %@",[dateFormatter dateFromString:@"2012"]);
[dateFormatter release];

Hope you are from +02:00 timezone. As NSDate always gives the time in GMT timezone, instead of printing 2012-01-01 00:00:00 +0000 , it is printing the above value which is the time in GMT timezone.

Edit:

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
[dateFormatter setDateFormat:@"yyyy"];
NSLog(@"NSDate : %@",[dateFormatter dateFromString:@"2012"]);
[dateFormatter release];

回复收藏 0 原文

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