Error:

PHP Warning: date_default_timezone_get(): 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 'America/New_York' for 'EDT/-4.0/DST' instead in /var/www/vhosts/adserver/httpdocs/lib/OX/Admin/Timezones.php on line 158

Fix:

Edit php.ini and add appropriate timezone.

date.timezone=America/New_York

List of timezones are available here: http://www.php.net/manual/en/timezones.php