try
    {
        SimpleDateFormat sdf = new SimpleDateFormat("MMM dd yyyy hh:mma",Locale.ENGLISH);
        Date d=sdf.parse("Apr 22 2012 01:00PM ");
        sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        System.out.println(sdf.format( d ));
        sdf = new SimpleDateFormat("yyyy-MM-dd hh:mma");
        System.out.println(sdf.format( d ));
    }catch (ParseException e) {
         e.printStackTrace();
    }