Adds or subtracts a duration from a Gregorian base date to return a new date. Durations may be any combination of days, weeks, months, and years. A special calendar control makes selections of the base date easy.
A free utility for converting dates between Gregorian, Julian, Hebrew, and French Republic calendars and for doing calculations on dates such as finding time spans or adding and subtracting time spans to dates. The Date Calculator is available for MacOS or Windows. The Date Calculator can work with fuzzy dates (such as just a year and a month) and still do conversions and calculations. Such fuzzy date calculations are useful for genealogists working with less than complete date information.
Download a free dates conversion add-in for Excel (97 and above). Converts to/from Julian, Gregorian and French Republic calendars. Adds many new functions to Excel and access to database for France giving the climate since 1370, the sovereigns, wars, diseases.
Bring your ancestors to life now, with Vivify. Vivify: The GEDCOM Birth Date Estimator will estimate a birth date for every person found missing one in your database. Vivify works by running your GEDCOM file through a battery of recursive, multipass, deep scanning algorithms designed to make the most accurate estimate possible. Vivify is available as a free web service.