Keep getting this warning message when I use PHP to display the date. How can this be fixed?

According to PHP's manual here it says:

Every call to a date/time function will generate a E_NOTICE if the time zone is not valid, and/or a E_STRICT or E_WARNING message if using the system settings or the TZ environment variable. See also date_default_timezone_set()

if you visit the date_default_timezone_set() you can see you can set the timezone that the date() function will use.

Going back to the date() function it gives you this as the first example

<?php
// set the default timezone to use. Available since PHP 5.1
date_default_timezone_set('UTC');


// Prints something like: Monday
echo date("l");

It's not a bad idea to set the timezone, especially if you're on a smaller shared server, you likely won't have access to change it in the ini file.

Try that and see if it fixes it. Personally I've not had it happen to me, but that should take care of it. Let me know.