Laravel, PHP Validate Datetime

validate.datetime.

 $time = null;
        if($timestamps instanceof DateTime){
            $time = new  \Carbon\Carbon($timestamps);
        }
        if($timestamps instanceof \Carbon\Carbon){
            $time = $timestamps;
        }
        if (is_integer($timestamps) && strtotime(date($format, $timestamps)) === (int)$timestamps) {
            $dateTime = date($format, $timestamps);
            $time =   new \Carbon\Carbon($dateTime);
         }
        if (is_string($timestamps) && strtotime($timestamps)) {
            $dateTime = date($format, strtotime($timestamps));
            $time =   new \Carbon\Carbon($dateTime);
         }
        return $time;

    echo '1';print_r(convert_time_u_to_carbon(time()));echo '<br/>';
    echo '2';print_r(convert_time_u_to_carbon(0));echo '<br/>';
    echo '3';print_r(convert_time_u_to_carbon(1));echo '<br/>';
    echo '4';print_r(convert_time_u_to_carbon("2016-2-23"));echo '<br/>';
    echo '5';print_r(convert_time_u_to_carbon("2016-23-3"));echo '<br/>';//dfdf
    echo '6';print_r(convert_time_u_to_carbon(-1));echo '<br/>';//dfdf
    echo '7';print_r(convert_time_u_to_carbon('asdfadfasd'));echo '<br/>';//dfdf
    echo '8';print_r(convert_time_u_to_carbon("2016223"));echo '<br/>';