checking if the month has thirty days . concode_field_sep int month concode_elem_sep int year concode_elem_sep int day concode_field_sep void setMonth concode_elem_sep void dayPassed concode_elem_sep boolean isThirtyOneDayMonth concode_elem_sep void daysOfMonth concode_elem_sep boolean isLeapYear concode_elem_sep void setYear concode_elem_sep int getDay concode_elem_sep boolean equal concode_elem_sep void monthPassed concode_elem_sep int getYear concode_elem_sep void setDay concode_elem_sep String toString concode_elem_sep int getMonth
boolean function ( ) { return month == 4 || month == 6 || month == 9 || month == 11 ; }