Any ideas on why this error is appearing wherever date should be displayed?

Warning: date() [function.date]: 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 'Antarctica/Macquarie' for 'EST/10.0/no DST' instead in /home/.../public_html/administrator/modules/mod_rsfirewall/tmpl/default.php on line 63

Joomla: 1.5.26
RSFirewall: 44

same problem here

I also ran into this, I modified two of RSFirewall's files adding a "date_default_timezone_set" function. In these two files;
administrator/modules/mod_rsfirewall/tmpl/default.php (added after line 15)
administrator/components/com_rsfirewall/views/rsfirewall/tmpl/default.php (added at line 45)

I had to add this line;
<?php date_default_timezone_set("UTC");?>
You will have to Google an appropriate timezone for your area, I used UTC

I think this should be set in the site's main php.ini file, not sure why I had to add it to the files. I would think Joomla adds a default line somewhere as there is a timezone setting in the global configuration settings, I don't see it in the configuration.php file though.