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.
This is an interactive German church calendar. Select the year and it will tell you one what days various feast days occurred. Sometimes events in church records are stated by the feast day (or number of Sundays after a feast day). This website will help determine the exact calendar date.