Hello togcpa,
welcome to the Polycom Community.
The community's VoIP FAQ contains this post here:
Jan 28, 2013 Question: Time and Date flashing or unable to set time correctly
Resolution: Please check => here <=
The above enables you to verify if you are getting the offset via DHCP or shows you a way to either manually change it via the web interface or importing a configuration.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services