objc 对时间的基本操作。取出时间

- (IBAction)reslut_value:(id)sender
{

    /*分别表示年、月、日、时、分、秒*/
    NSInteger unitFlags = NSYearCalendarUnit |
    NSMonthCalendarUnit |
    NSDayCalendarUnit |
    NSWeekCalendarUnit |
    NSHourCalendarUnit|
    NSMinuteCalendarUnit |
    NSSecondCalendarUnit;
    //********************

    NSDate *date = [NSDate date];

    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *comps;
    comps = [calendar components: unitFlags fromDate:date];

    /*分别取出年、月、日、时、分、秒*/
    int year = [comps year];
    int month = [comps month];
    int day = [comps day];
    int hour = [comps hour];
    int min = [comps minute];
    int sec = [comps second];
    //************************

    /*打印输出time*/
    NSLog(@"time:%i-%i-%i %i:%i:%i\n",year,month,day,hour,min,sec);

}


//输出结果为： Calculator[2233:f803] time:2012-6-27 16:13:23