ios - how to convert string date to nsdate using formatter? -

i follow stackoverflow answer , write code don't know happen.it won't work. plz,any 1 can solve me. use fooling code....

        nsmutablearray *moviedate;     nsarray *temp1 = [_dicupcomingmovie objectforkey:@"results"];     (nsdictionary *temp2 in temp1)     {         nsdateformatter *formatter = [[nsdateformatter alloc]init];          nsstring *datestring = [temp2 valueforkey:@"release_date"];         //nsdate *mydate = [[nsdate alloc]init];         [formatter setdateformat:@"dd mmm,yyyy"];         nsdate *date = [formatter datefromstring:datestring];         nslog(@"%@",date);         [moviedate addobject:date];         nslog(@"%@",moviedate);     } 

so it. above code not work mydate object still nil

i believe datestring doesn't match format specified. see nsdateformatter complete example.