Date Picker not showing after selected

is it this part that needs changed for the invalid format error?

unction WAGetDateFormat($value, $dateFormat) {
$isUSServ = (date("n", strtotime("1/2/2006")) == 1);
$tValue = $value;
$isEuroDate = (($dateFormat && strpos($dateFormat, "[12]\\d|3[0-1]") < strpos($dateFormat, "1[0-2]|") && strpos($dateFormat, "\\w*") === false) || (!$isUSServ));
if (($isEuroDate && $isUSServ) || (!$isEuroDate && !$isUSServ)) {
$datePattn = "/(\\d*)[-\\.\\/](\\d*)[-\\.\\/](\d*)/";
preg_match($datePattn, $tValue, $tMatch);
if ($tMatch && sizeof($tMatch)) {
if ($isEuroDate) {
$value = $tMatch[2] . "/" . $tMatch[1] . "/" . $tMatch[3];
}
else {
$value = $tMatch[1] . "/" . $tMatch[2] . "/" . $tMatch[3];
}
if (strpos($tValue, " ") !== false) {
$value .= substr($tValue, strpos($tValue, " "));
}
}
}
return strtotime(preg_replace("/[\.-]/", "/", $value));
}


thanks