ios - NSDate 问题，日期应该是前一天

Question

我想实现一个方法，计算一个月的天数。一切都很好，除了我的约会是应该的前一天。在下面的示例中，日期是“2012-09-14 21:00:00 +0000”，应该是 2012-09-15 21:00:00 +0000 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];

Answer 1

您的时区似乎类似于 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。