Short description of WinDate Calculator 2.4: WinDate Calculator is a flexible utility program that allows you to quickly perform date calculations without having to manually thumb thru a calendar. It can work with any dates between Sept. 14, 1752 and Dec. 31, 3999. Features include the ability to define count criteria, mark recurring holidays, perform calculations by days/weeks/months/years, copy/paste dates in a variety of formats, and optionally sit in the Windows system tray.