NSLog(@"當前時間：%@",[NSDate date]);
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *date=[NSDate date];
NSDateComponents *component=[calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit |NSSecondCalendarUnit) fromDate:date];
NSLog(@"%ld",(long)[component year]);
NSLog(@"%ld",(long)[component month]);
NSLog(@"%ld",(long)[component day]);
NSLog(@"%ld",(long)[component hour]);
NSLog(@"%ld",(long)[component minute]);
NSLog(@"%ld",(long)[component second]);
[component weekday]
[component weekOfMonth]
[component weekOfYear]
