code: public DatePickerDialog date(int day, int month, int year){
          mDatePickerLayout.setDate(day, month, year);
          return this;
      }
docs: Set the selected date of this DatePickerDialog.
  @param day The day value of selected date.
  @param month The month value of selected date.
  @param year The year value of selected date.
  @return The DatePickerDialog for chaining methods.