App\Libraries\Utils::timestampToString PHP Method

    public static function timestampToString($timestamp, $timezone = false, $format)
    {
        if (!$timestamp) {
            return '';
        }
        $date = Carbon::createFromTimeStamp($timestamp);
        if ($timezone) {
            $date->tz = $timezone;
        }
        if ($date->year < 1900) {
            return '';
        }
        return $date->format($format);
    }

 public static function dateToString($date)
 {
     if (!$date) {
         return false;
     }
     $dateTime = new DateTime($date);
     $timestamp = $dateTime->getTimestamp();
     $format = Session::get(SESSION_DATE_FORMAT, DEFAULT_DATE_FORMAT);
     return Utils::timestampToString($timestamp, false, $format);
 }