Nexus Mod Manager and Wrye Bash can change the date for you. No need to do it manually (although I think can you manually edit the date in Wrye Bash as well).
Update 1.4.26 - currently available as a Steam beta patch - adds load order management to the Skyrim launcher. http://www.bethblog.com/2012/02/20/new-beta-update-available-on-steam/