Setting timezone for your website with hPanel and PHP function
Your server's global time configuration cannot be changed, however, you can set the timezone for your website using hPanel or PHP function:
Setting up timezone via hPanel
Open Hosting → Manage → PHP Configuration page. There, open the PHP options tab and edit the date.timezone value:

If you are not sure which time zone to insert, check the Time Zone Map.
Save the changes at the bottom of the page, and the timezone will be updated successfully ????
Setting up timezone via PHP function
As an alternative to the previous option, you can set the timezone using date_default_timezone_set PHP function. Just check the List of Supported Timezones, find the one which you need, and insert the following code to your website (in most cases, to index.php):
<?php
date_default_timezone_set("Asia/Bangkok");
echo date_default_timezone_get();
?>
NOTES:
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Don't forget to change "Asia/Bangkok" to the desired timezone
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PHP documentation on date_default_timezone_set function
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This change will affect only files. You can also apply a different time zone for the database (1 session)