獲取當前時間的 年月日時分秒

    NSDate *now = [NSDate date];

    NSLog(@"now date is: %@", now);

    

    NSCalendar *calendar = [NSCalendar currentCalendar];

    NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit |        NSMinuteCalendarUnit | NSSecondCalendarUnit;

    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];

    

    NSInteger year = [dateComponent year];

    NSInteger month = [dateComponent month];

    NSInteger day = [dateComponent day];

    NSInteger hour = [dateComponent hour];

    NSInteger minute = [dateComponent minute];

    NSInteger second = [dateComponent second];

    

    NSLog(@"year is: %ld", year);

    NSLog(@"month is: %ld", month);

    NSLog(@"day is: %ld", day);

    NSLog(@"hour is: %ld", hour);

    NSLog(@"minute is: %ld", minute);

    NSLog(@"second is: %ld", second);