question: returns the hash code for this date . concode_field_sep long MILLIS_DAY concode_elem_sep int month concode_elem_sep int year concode_elem_sep int day concode_field_sep EasyDate add concode_elem_sep int getYear concode_elem_sep int daysTo concode_elem_sep boolean equals concode_elem_sep boolean isLeapYear concode_elem_sep String toString concode_elem_sep int getMonth concode_elem_sep int compareTo concode_elem_sep int getDay
target: int function ( ) { return year * 400 + month * 31 + day ; }