formate date as per my requirement
===

I want  to make date by date formatter 
`2012-07-12` but it display like
`2012-01-12`
My code:

`
  NString *today_selected=@"2012-07-12"
  NSDateFormatter *Df=[[NSDateFormatter alloc]init];

    [Df setDateFormat:@"YYYY-MM-DD" ];

    NSDate *date_selected=[Df dateFromString: today_selected];

    NSLog(@"today_selected:%@",date_selected);

`

but it display 2012-01-12