如何使用javascript和php获取本地系统WITH TIMEZONE的机器时间(系统时间)?

Is there a way to get the visitors of my website's system time? I want to get the current time on their device when they visited my website, I also want the timezone.

On https://www.elfqrin.com/binfo_check_anonymity.php uder SYSTEM, there is an option to get the system time using JS, it also shows the timezone.

E.g. Sat May 11 2019 12:39:43 GMT-0700 (Arizona Standard Time)

Does anyone know how get that value into a PHP variable?

I have looked at some time functions in JS but all of them get time from the server, not from the local machine.

I would like the whole thing in one php file

<html>
<script>...</script>
<?php
....
?>
</html>

I am expecting something like Sat May 11 2019 12:39:43 GMT-0700 (Arizona Standard Time) But currently I only know how to get server time