Hundreds of error messages

[crash56]

Greetings,

Our forum recently began generating the following error message whenever anyone navigates to a new page on the forum ... which means hundreds of error messages. 

2: strftime() [<a href='function.strftime'>function.strftime</a>]: 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/Los_Angeles' for 'PDT/-7.0/DST' instead
File: /home/terrafir/public_html/Sources/Subs.php
Line: 869

Theh File and Line varies a little bit, but the error is the same every time. I've checked with our webhost, and the time (American/Los_Angeles) is set at the server. 

Can someone suggest what has gotten messed up or what we need to adjust to get this to stop?

Thanks

Crash56

[crash56]

Disregard.  Found the problem.