I'm getting the 'Warning strtotime() [function.strtotime]' message

When performing the System Check, RSFirewall! might prompt you to allow it to Attempt to fix PHP Configuration, as it has found some incorrectly set parameters that can jeopardize your website's security. In doing so, the component will create a php.ini file in your website's root folder that will set some parameters meant to increase the website's overall security level.

The issue that brought you here is most likely being generated by the fact that the php.ini file generated by RSFirewall! is overriding the time zone settings provided by the server. To check this, simply rename the following file:

root/php.ini

to php.txt

...and check if the issue persists. If it doesn't, please edit the file again and add the following line:

date.timezone = "your_desired_timezone"

Then, rename it back to php.ini.