ios-通过NSCalendar来获取当前时间的年、月、日、时、分、秒

void getDate()
{
    // 通过NSDate获取当前时间
    NSDate *now = [NSDate date];
    NSLog(@"Now date is: %@", now);
    
    // 通过NSCalendar来过滤当前时间
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSUInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    NSDateComponents *dateComponent = [calendar components:unitFlags fromDate:now];
    
    int year = [dateComponent year];
    int month = [dateComponent month];
    int day = [dateComponent day];
    int hour = [dateComponent hour];
    int minute = [dateComponent minute];
    int second = [dateComponent second];
    
    NSLog(@"year is: %d", year);
    NSLog(@"month is: %d", month);
    NSLog(@"day is: %d", day);
    NSLog(@"hour is: %d", hour);
    NSLog(@"minute is: %d", minute);
    NSLog(@"second is: %d", second);
}