Help 4.1.5 to 4.2.2

[WolfWiz]

Just did the upgrade on Vb4 and all went smooth in scripting. However I am getting this when I try to access site and nothing else.

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. Please use the date.timezone setting, the TZ environment variable 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/Denver' for 'MDT/-6.0/DST' instead in ..../includes/functions.php on line 5110
Unable to add cookies, header already sent.
File: /home1/tellyour/public_html/epidog/includes/class_core.php
Line: 5755

Can someone please help me.

THanks

--------------- Added [DATE]1431162448[/DATE] at [TIME]1431162448[/TIME] ---------------

Disregard fixed!