In the works, though not a feature yet... do a search for the "calendar" thread for details. Till then, you either have to fake it in RW with the default calendar, or utilize an outside source such as open office (for an excel type spreadsheet) or masterplan for managing your game calendar .
http://www.habitualindolence.net/masterplan/
Also if you are utilizing Herolab, there is a thread for using Herolab to track spell effects.
Discussions located here>
http://forums.wolflair.com/showthrea...effect&page=15