Setting the Time Zone

When scheduling a page, I noticed that the time zone of Percussion (not the server it’s on) is set differently than where we’re located.

How do I go about setting the time zone for Percussion?

Percussion picks up the operating system time settings.  Each server involved in a Percussion deployment should have their operating system time set with a Network Time service.  CM1, DTS, Web Server, and Database server. In a Windows environment this would be the Windows Time Service.  In linux this is typically ntpd.  This keeps everything in synch date and time wise. 

For the time zone itself:
Here is a link to changing the Time Zone on Windows.  On Linux servers it depends on the flavor of Linux, this article has some generic steps.