This will calculate how much time there is left til the date that you give it. It puts this in the titlebar of your mIRC, so it's always easy to see. It is easy to setup, since I even have it automate updating your INI files to make it work right.
And the GUI is simple and straight-forward to use. Comes in handy when you become an IRC junkie & you can't remember how many days you got left til its your girlfriends birthday ;).