NSCalendar 和 NSDateComponents 返回意外日期

发布于 2024-12-15 05:57:54 字数 753 浏览 0 评论 0原文

我正在尝试从 NSCalendar 和 NSDateComponents 创建一个 NSDate：

    NSCalendar *calendar = [NSCalendar currentCalendar];
    [calendar setTimeZone:[NSTimeZone localTimeZone]]; 
    NSDateComponents *components = [[NSDateComponents alloc] init];
    [components setDay:[self.day intValue]];
    [components setMonth:[self.month intValue]];
    [components setYear:[self.year intValue]];
    self.date = [calendar dateFromComponents:components];

当日、月、年为：9/31/2011时，NSDate 为10/1/2011 >。我在测试后设置了 NSCalendar 的时区，这并没有改变 NSDate。我也尝试过

[calendar setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];

，它给了我9/30/2011。有人发现我的计算方式有错误吗？

谢谢。

原文

I'm trying to create an NSDate from NSCalendar and NSDateComponents with:

    NSCalendar *calendar = [NSCalendar currentCalendar];
    [calendar setTimeZone:[NSTimeZone localTimeZone]]; 
    NSDateComponents *components = [[NSDateComponents alloc] init];
    [components setDay:[self.day intValue]];
    [components setMonth:[self.month intValue]];
    [components setYear:[self.year intValue]];
    self.date = [calendar dateFromComponents:components];

When the day, month, year are : 9/31/2011 the NSDate is for 10/1/2011. I set the timezone for the NSCalendar after testing which didn't change the NSDate. I also tried

[calendar setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];

Which gave me back 9/30/2011. Anyone see an error in the way I'm calculating this?

Thanks.

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皓月长歌 2024-12-22 05:57:54

嗯，9 月 31 日确实是 10 月 1 日。

但组件必须知道在哪个日历中工作。以下代码来自苹果

NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:6];
[comps setMonth:5];
[comps setYear:2004];
NSCalendar *gregorian = [[NSCalendar alloc]
    initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date = [gregorian dateFromComponents:comps];
[comps release];

Well, september 31 is really october first.

But a component has to know in which calendar to work. The following code is from apple

NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setDay:6];
[comps setMonth:5];
[comps setYear:2004];
NSCalendar *gregorian = [[NSCalendar alloc]
    initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *date = [gregorian dateFromComponents:comps];
[comps release];

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