[Users] Timezones

I have a setup of several linux guests and my EL6 guests routinely get stuck at the fsck check when they boot up because the last modification is in the future. I assume I need to change something in the guest to tell it what timezone the host is. I notice that for linux guests you cannot change what the host reports to the guest, which makes me think the guest is supposed to magically just know. What is the proper way to deal with this situation? - Thomas