The error says it all. Relying on system's timezone settings is a bad idea and therefore you 'll need to specify a timezone using one of the following options.
You have three solutions:
Set a default timezone in your PHP script using
date_default_timezone_set()
:date_default_timezone_set("America/Los_Angeles");
Use
ini_set()
to set a default timezone:ini_set('date.timezone', 'America/Los_Angeles');
Define it as
date.timezone
in yourphp.ini
file.
Documentation: date_default_timezone_set()
ini_set()
Hope this helps!