code: public void setDate(int year, int month, int day) {
          Calendar to = Calendar.getInstance();
          to.set(year, month, day);
          setDate(to);
      }
docs: This function set the date on the DatePicker using the year, month and day provided. <b>Note:</b> month is
  0-based (January - 0)
  
  @param year
  The full year.
  @param month
  The month. (0-based, 0 for January)
  @param day
  The day of the month.