When installing Drupal I get the following error msg

Warning: DateTime::createFromFormat(): 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 the timezone 'UTC' for now, but please set date.timezone to select your timezone. in Symfony\Component\HttpFoundation\Response->sendHeaders() (line 331 of vendor/symfony/http-foundation/Response.php).
Symfony\Component\HttpFoundation\Response->sendHeaders() (Line: 371)
Symfony\Component\HttpFoundation\Response->send() (Line: 637)
install_run_task(Array, Array) (Line: 538)
install_run_tasks(Array) (Line: 115)
install_drupal(Object) (Line: 44)

Does this refer to the timezone used by FreeBSD or is it something within php?. I know timezone is set on installation but where is the value held?

According to phpinfo()

Timezone Database internal
Default timezone UTC

date.timezone no value no value