Description:
------------
According to <http://php.net/manual/en/function.date-default-timezone-set.php>, "Since PHP 5.1.0 (when the date/time functions were rewritten), every call to a date/time function will generate a E_NOTICE if the timezone isn't valid, and/or a E_WARNING message if using the system settings or the TZ environment variable.".

The changelog section of that page says that in 5.3.0 the behavior was changed to throw "E_WARNING rather than E_STRICT".

The fact that neither is thrown as of PHP 7.0, however, is not mentioned and it seems like it ought to be:

http://php.net/manual/en/migration70.other-changes.php