This is a php server issue.
The host should be able to update the php.ini file for you to set the default timezone to prevent that error from occurring. It happens if the default time zone is not set in the php.ini.
alternativly, you can add the following at line 1 of the results page:
but it is best to set the default time zone in the php.ini file so you won't have to keep setting it in other files.
The list of valid timezones is here...