On the admin menus:
Choose edit next to the date/time section
Set you parameters for timezone then select either a NTP or manual date/time.
Is there a way to use an NTP server to do this? I've poked around and haven't found anything but perhaps someone else knows a way?
You, as an admin, need to set the NTP server in System>Status>Overview, edit system date & time. (please be sure to set the time zone correctly as well).