Error/warning message on this page

This page currently shows some warning message. I guess the admin should know ;)

warning: strtotime() [function.strtotime]: 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 'Europe/Berlin' for 'CEST/2.0/DST' instead in /home/www/moc4/modules/comment/comment.module on line 1513.

Thanks but we know and it's already been reported to the authorities.