根據 <span style="font-family: Arial, Helvetica, sans-serif;">NSDate 獲取當前星期幾  返回格式 2014-1-1 星期五</span>

        NSDate*date = [NSDate date];
            NSCalendar*calendar = [NSCalendar currentCalendar];
            NSDateComponents*comps;
            comps =[calendar components:(NSWeekCalendarUnit | NSWeekdayCalendarUnit |NSWeekdayOrdinalCalendarUnit)
                               fromDate:date];
            
            NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init] ;
            [dateFormatter setDateFormat:@"YYYY-MM-dd-EEEE"];
           ;
 

[dateFormatter stringFromDate:date] 就是  2014-1-1 星期一  這種效果