iOS开发 根据日期计算是星期几详解手机开发

 NSDateComponents *_comps = [[NSDateComponents alloc] init]; 

 [_comps setDay:23]; 

 [_comps setMonth:3]; 

 [_comps setYear:2014]; 

 NSCalendar *gregorian = [[NSCalendar alloc] 

 initWithCalendarIdentifier:NSGregorianCalendar]; 

 NSDate *_date = [gregorian dateFromComponents:_comps]; 

 NSDateComponents *weekdayComponents = 

 [gregorian components:NSWeekdayCalendarUnit fromDate:_date]; 

 int _weekday = [weekdayComponents weekday]; 

 NSLog(@"_weekday::%d",_weekday); 

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