WinDate Calculator performs date calculations, such as: the number of days between two dates; what date is 'x' days from another date; what day of the week a certain date is; and so on. The program will work with any dates from Sept. 14, 1752, which is the official beginning of the English Gregorian calendar, and Dec. 31, 3999. The program couldn't be simply to use, but it includes small a Help file.