If you get this error
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.
then just manually put the following code (With appropriate changes) into your code, just before any call to date() or anything related.
That fixes it.