2019独角兽企业重金招聘Python工程师标准>>> 
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *comps = [[NSDateComponents alloc] init];
NSInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitWeekday | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
NSDate *now = [NSDate date];
comps = [calendar components:unitFlags fromDate:now];
NSLog(@"%ld年%ld月%ld日",(long)[comps year],(long)[comps month],(long)[comps day]);
NSLog(@"%ld",(long)[comps weekday]); // 星期日是数字1，以此类推...