warning: date_default_timezone_get() [function.date-default-timezone-get]:

Hi -

I have the GCal events module running a feed from a calendar to my site. It has been working wonderfully until now... I am getting the following error. Any ideas on how to fix it?

warning: date_default_timezone_get() [function.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/Denver' for 'MDT/-6.0/DST' instead in /Applications/MAMP/htdocs/sustainblaine.com/modules/gcal_events/gcal_events.module on line 48.