static function validate_date($input, $form_id_num)
{
// Checks date input for proper formatting of actual calendar dates
// Matches the date format and also validates month and number of days in a month.
// All leap year dates allowed.
if (!self::$form_options) {
self::$form_options = FSCF_Util::get_form_options($form_id_num, $use_defaults = true);
}
$date_format = self::$form_options['date_format'];
// find the delimiter of the date_format setting: slash, dash, or dot
if (strpos($date_format, '/')) {
$delim = '/';
$regexdelim = '\\/';
} else {
if (strpos($date_format, '-')) {
$delim = '-';
$regexdelim = '-';
} else {
if (strpos($date_format, '.')) {
$delim = '.';
$regexdelim = '\\.';
}
}
}
if ($date_format == "mm{$delim}dd{$delim}yyyy") {
$regex = "/^(((0[13578]|(10|12)){$regexdelim}(0[1-9]|[1-2][0-9]|3[0-1]))|(02{$regexdelim}(0[1-9]|[1-2][0-9]))|((0[469]|11){$regexdelim}(0[1-9]|[1-2][0-9]|30))){$regexdelim}[0-9]{4}\$/";
}
if ($date_format == "dd{$delim}mm{$delim}yyyy") {
$regex = "/^(((0[1-9]|[1-2][0-9]|3[0-1]){$regexdelim}(0[13578]|(10|12)))|((0[1-9]|[1-2][0-9]){$regexdelim}02)|((0[1-9]|[1-2][0-9]|30){$regexdelim}(0[469]|11))){$regexdelim}[0-9]{4}\$/";
}
if ($date_format == "yyyy{$delim}mm{$delim}dd") {
$regex = "/^[0-9]{4}{$regexdelim}(((0[13578]|(10|12)){$regexdelim}(0[1-9]|[1-2][0-9]|3[0-1]))|(02{$regexdelim}(0[1-9]|[1-2][0-9]))|((0[469]|11){$regexdelim}(0[1-9]|[1-2][0-9]|30)))\$/";
}
if (!preg_match($regex, $input)) {
return false;
} else {
return true;
}
}
