. # This file contains functions to manipulate/calculate dates/times function ymd_to_days($year, $month, $day) { return (int)(mktime(12,0,0,$month,$day, $year, 0) / 86400); } function days_to_ymd($days) { return explode('-', date('Y-n-j', $days * 86400 + 43200)); } function days_to_weekday_name($days) { $day_names = array('Thursday', 'Friday', 'Saturday', 'Sunday', 'Monday', 'Tuesday', 'Wednesday'); return $day_names[$days % 7]; } #function time_test() { # for($i = 0; $i < 41 * 86400; $i += 86399) { # echo "seconds: $i"; # $days = (int)($i / 86400); # list($year, $month, $day) = days_to_ymd($days); # echo ", days_to_ymd($days): $year-$month-$day"; # $days = ymd_to_days($year, $month, $day); # echo ", ymd_to_days($year, $month, $day): $days\n
"; # } #} # pass anything, and get a valid date # # returns array($year, $month, $day) function clean_ymd($year, $month, $day) { $year = intval($year, 10); $month = intval($month, 10); $day = intval($day, 10); if($year < 100) { $year += 2000; } if($month < 1) { $month = 1; } elseif($month > 12) { $month = 12; } if($day < 1) { $day = 1; } elseif($day > 31) { # FIXME this should check the month $day = 31; } return array($year, $month, $day); } # convert date string from mm/dd/yyyy to yyyy-mm-dd function mdy_to_ymd($date) { $date = ereg_replace('[^0-9/-]', '', $date); $date = ereg_replace('-', '/', $date); $parts = explode('/', $date); switch(count($parts)) { case 1: $year = $parts[0]; if(strlen($year) == 0) { list($month, $day, $year) = explode('/', date('m/d/Y')); } else { list($month, $day) = explode('/', date('m/d')); } break; case 2: list($month, $year) = $parts; $year = date('d'); break; default: list($month, $day, $year) = $parts; } list($year, $month, $day) = clean_ymd($year, $month, $day); return sprintf('%04u-%02u-%02u', $year, $month, $day); } # convert date string from yyy-mm-dd to mm/dd/yyyy function ymd_to_mdy($date) { $date = ereg_replace('[^0-9/-]', '', $date); $date = ereg_replace('/', '-', $date); $parts = explode('-', $date); switch(count($parts)) { case 1: $year = $parts[0]; if(strlen($year) == 0) { list($year, $month, $day) = explode('-', date('Y-m-d')); } else { list($month, $day) = explode('-', date('m-d')); } break; case 2: list($year, $month) = $parts; $year = date('d'); break; default: list($year, $month, $day) = $parts; } list($year, $month, $day) = clean_ymd($year, $month, $day); return sprintf('%02u/%02u/%04u', $month, $day, $year); } function enc_mdy($date) { return ymd_to_mdy($date); } ?>