Error after upgrading PHP

[aee156]

I have upgraded PHP and with my whmcs billing system I am now getting this error

Warning: PDO::__construct(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/thewebse/public_html/billing/vendor/illuminate/database/Illuminate/Database/Connectors/Connector.php on line 47

Warning: PDO::__construct(): The server requested authentication method unknown to the client [mysql_old_password] in /home/thewebse/public_html/billing/vendor/illuminate/database/Illuminate/Database/Connectors/Connector.php on line 47
Critical Error
SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client

Any ideas how to fix this issue? I have spent hours trying to figure it out.

 

[cPanelMichael]

Hello,

I found the following WHMCS links that address these two error messages:

Changing Timezone - WHMCS Documentation
Update 6.0.1 failed

Keep in mind you can post issues related to WHMCS directly on their forums at:

WHMCS Community Forums

Thank you.