IOS-NSDate之今天，昨天，这周，这个月，上个月

http://blog.csdn.net/xdrt81y/article/details/8425727

今天跟大家讨论日期的用法，相信大家在项目中，经常会设置一个默认时间段，比如一周前到今天。下面教大家怎么获取前一天，或前一周等等。

比如date 2009-12-11

NSDate *today = [NSDate dateWithString:@"2009-12-11 00:00:00 +0000"];

 NSDate *yesterday = [NSDate dateWithString:@"2009-12-10 00:00:00 +0000"];

 NSDate *thisWeek = [NSDate dateWithString:@"2009-12-06 00:00:00 +0000"];

 NSDate *lastWeek = [NSDate dateWithString:@"2009-11-30 00:00:00 +0000"];

 NSDate *thisMonth = [NSDate dateWithString:@"2009-12-01 00:00:00 +0000"];

 NSDate *lastMonth = [NSDate dateWithString:@"2009-11-01 00:00:00 +0000"];

要求出上面的时间

NSCalendar *cal = [NSCalendar currentCalendar];

NSDateComponents *components = [cal components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit ) fromDate:[[NSDate alloc] init]];

[components setHour:-[components hour]];

[components setMinute:-[components minute]];

[components setSecond:-[components second]];

NSDate *today = [cal dateByAddingComponents:components toDate:[[NSDate alloc] init] options:0]; //This variable should now be pointing at a date object that is the start of today (midnight);

[components setHour:-24];

[components setMinute:0];

[components setSecond:0];

NSDate *yesterday = [cal dateByAddingComponents:components toDate: today options:0];

components = [cal components:NSWeekdayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:[[NSDate alloc] init]];

[components setDay:([components day] - ([components weekday] - 1))];

NSDate *thisWeek  = [cal dateFromComponents:components];

[components setDay:([components day] - 7)];

NSDate *lastWeek  = [cal dateFromComponents:components];

[components setDay:([components day] - ([components day] -1))];

NSDate *thisMonth = [cal dateFromComponents:components];

[components setMonth:([components month] - 1)];

NSDate *lastMonth = [cal dateFromComponents:components];

NSLog(@"today=%@",today);

NSLog(@"yesterday=%@",yesterday);

NSLog(@"thisWeek=%@",thisWeek);

NSLog(@"lastWeek=%@",lastWeek);

NSLog(@"thisMonth=%@",thisMonth);

NSLog(@"lastMonth=%@",lastMonth);

正在学习过程中，错误之处请指正，欢迎交流，共同学习；

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巴特西

IOS-NSDate之今天，昨天，这周，这个月，上个月

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