function compare_month_gap($first_date, $second_date, $monthgap) { // checks gap in months between two dates (to check for birth less than X months after wedding) include_once CMS_ROOTPATH . 'include/calculate_age_cls.php'; $process_date = new calculate_year_cls(); // take care of combined julian/gregorian dates (1678/9) if (strpos($first_date, '/') > 0) { $temp = explode('/', $first_date); $first_date = $temp[0]; } if (strpos($second_date, '/') > 0) { $temp = explode('/', $second_date); $second_date = $temp[0]; } $first_date = strtoupper($first_date); // $process_date->search_month uses upppercase months: DEC, FEB $second_date = strtoupper($second_date); $year1 = $process_date->search_year($first_date); $month1 = $process_date->search_month($first_date); $day1 = $process_date->search_day($first_date); $year2 = $process_date->search_year($second_date); $month2 = $process_date->search_month($second_date); $day2 = $process_date->search_day($second_date); if ($year1 and $year2 and $month1 and $month2) { if ($year1 == $year2) { // dates in same year - we can deduct month1 from month2 if ($month2 - $month1 < $monthgap) { return $month2 - $month1; } else { return false; } } elseif ($year1 + 1 == $year2) { // consecutive years if (12 - $month1 + $month2 < $monthgap) { return 12 - $month1 + $month2; } else { return false; } } else { return false; } } else { return false; } // insufficient data }