The time under which your WHMCS installation will run is based upon the server clock and the timezone setting in your PHP configuration. Therefore to change the time displayed in WHMCS there are two options:
- Change the server clock directly
- Edit the PHP configuration specifying a different timezone.
Changing the server clock may not be desirable if clients are hosted on the server and would require root access, so option 2 is the most viable for the majority of users. A number of hosting providers allow the PHP configuration to be changed on an individual directory by creating a php.ini file within the WHMCS directory. In that situation the following line could be added:
For a full list of the available timezone localities you can use, please refer to http://www.php.net/manual/en/timezones.php
Please contact your hosting provider/server admin if you are unsure how to customise the PHP configuration of your server.