IOS 获取年月日、星期

#pragma mark - 获取年月日及星期
+ (NSString *)stringFromDate
{
    // 添加日期
    
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *comps = [[NSDateComponents alloc] init];
    NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit |
    NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
    
    NSDate *  senddate=[NSDate date];
    NSDateFormatter  *dateformatter=[[NSDateFormatter alloc] init];
    [dateformatter setDateFormat:@"YYYY-MM-dd"];
    comps = [calendar components:unitFlags fromDate:senddate];
    NSString *locationString=[dateformatter stringFromDate:senddate];
    NSString *date_weekStr = [NSString stringWithFormat:@"%@ %@",locationString,[self week:[comps weekday]]];
    return date_weekStr;
}

#pragma mark - 推算星期
+(NSString *)week:(NSInteger)week
{
    NSString *weekStr=nil;
    if(week==1)
    {
        weekStr=@"星期天";
    }else if(week==2){
        weekStr=@"星期一";
        
    }else if(week==3){
        weekStr=@"星期二";
        
    }else if(week==4){
        weekStr=@"星期三";
        
    }else if(week==5){
        weekStr=@"星期四";
        
    }else if(week==6){
        weekStr=@"星期五";
        
    }else if(week==7){
        weekStr=@"星期六";
        
    }
    return weekStr;
}

IOS 获取年月日、星期

原文：http://blog.csdn.net/missafeng/article/details/45218951