int day = Integer.parseInt(request.getParameter("day"));  // 25
int month = Integer.parseInt(request.getParameter("month")); // 12
int year = Integer.parseInt(request.getParameter("year")); // 1988

System.out.println(year);

Calendar c = Calendar.getInstance();
c.set(year, month, day, 0, 0);  

b.setDob(c.getTime());

System.out.println(b.getDob());  

Wyjście to:

1988
Środa 25 stycznia 00:00:08 IST 1989

Mijam25 12 1988 ale dostaję25 Jan 1989. Czemu?