NSDate问题，日期应该是前一天
我想实现方法，该方法将计算一个月的天数。一切都很好，除了我的约会是前一天。在以下示例中，日期为“2012-09-14 21:00:00 +0000”，应为 2012-09-15 21:00:00 +0000 将感谢您的帮助。我的代码是：
NSDictionary *curDay = [NSDictionary dictionaryWithObjectsAndKeys:
@"9",@"mounthNumber",@"15",@"day",@"2012",@"year", nil];
NSDateComponents *selectedMounth = [[[NSDateComponents alloc] init] autorelease];
NSCalendar *calendar = [[[NSCalendar alloc]initWithCalendarIdentifier:
NSGregorianCalendar] autorelease];
NSTimeZone *timezone = [NSTimeZone systemTimeZone];
[calendar setTimeZone: timezone];
[selectedMounth setYear:[[curDay objectForKey:@"year"] integerValue]];
[selectedMounth setMonth:[[curDay objectForKey:@"mounthNumber"] integerValue]];
[selectedMounth setDay:[[curDay objectForKey:@"day"] integerValue]];
NSDate *date = [calendar dateFromComponents:selectedMounth];
I want to implement method, that will count the number of days in month. Everything is fine except my date is the day before then it should be. In the following example date is "2012-09-14 21:00:00 +0000" and should be 2012-09-15 21:00:00 +0000 Will appreciate for your help. My code is:
NSDictionary *curDay = [NSDictionary dictionaryWithObjectsAndKeys:
@"9",@"mounthNumber",@"15",@"day",@"2012",@"year", nil];
NSDateComponents *selectedMounth = [[[NSDateComponents alloc] init] autorelease];
NSCalendar *calendar = [[[NSCalendar alloc]initWithCalendarIdentifier:
NSGregorianCalendar] autorelease];
NSTimeZone *timezone = [NSTimeZone systemTimeZone];
[calendar setTimeZone: timezone];
[selectedMounth setYear:[[curDay objectForKey:@"year"] integerValue]];
[selectedMounth setMonth:[[curDay objectForKey:@"mounthNumber"] integerValue]];
[selectedMounth setDay:[[curDay objectForKey:@"day"] integerValue]];
NSDate *date = [calendar dateFromComponents:selectedMounth];
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你的时区似乎是 GMT-3（或 GMT+3，我不记得了）。使用 GMT 代替
systemTimeZone：[NSTimeZone timeZoneWithAbbreviation:@"GMT"];它可以解决您的问题。Your timeZone seems to be something like GMT-3 (or GMT+3, I never remember). Instead of the
systemTimeZoneuse the GMT one:[NSTimeZone timeZoneWithAbbreviation:@"GMT"];and it solves your problem.