Exception Occurred

A program exception has occurred in the application "News Admin". Here are the details for the error:

ErrorException

A PHP Error has occurred: #2 (E_WARNING) strtotime(): 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/Chicago' for 'CDT/-5.0/DST' instead in: ROOTDIR/grunt/lib/fields.php on 1091.

Error ID: #54181E0B91AA5 (2014-09-16 06:24:59)