Error Strict Standards: strtotime() ...

[shawn_a]

It means your server does not set a timezone, which it should.
Set it in gsconfig for fallback when not logged in or set for a user.

PHP Code:

# Define default timezone of server, accepts php timezone string
# valid timeszones can be found here http://www.php.net/manual/en/timezones.php
# define('GSTIMEZONE', 'America/Chicago'); 


also your version is old