ios获取当前年月日和星期

//获取日期

    NSArray * arrWeek=[NSArray arrayWithObjects:@"星期日",@"星期一",@"星期二",@"星期三",@"星期四",@"星期五",@"星期六", nil];

    NSDate *date = [NSDate date]; 

    NSCalendar *calendar = [[[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar] autorelease]; 

    NSDateComponents *comps = [[[NSDateComponents alloc] init] autorelease]; 

    NSInteger unitFlags = NSYearCalendarUnit | 

    NSMonthCalendarUnit | 

    NSDayCalendarUnit | 

    NSWeekdayCalendarUnit | 

    NSHourCalendarUnit | 

    NSMinuteCalendarUnit | 

    NSSecondCalendarUnit; 

    comps = [calendar components:unitFlags fromDate:date]; 

    int week = [comps weekday]; 

    int year=[comps year]; 

    int month = [comps month]; 

    int day = [comps day]; 

    m_labDate.text=[NSString stringWithFormat:@"%d年%d月",year,month];

    m_labToday.text=[NSString stringWithFormat:@"%d",day];

    m_labWeek.text=[NSString stringWithFormat:@"%@",[arrWeek objectAtIndex:week]];