Calendars & Dates » Calculators & Converters

10,000-Year Calendar

Choose menu options and view a month or year calendar for any year 1 to 10000 A.D.

Calculate the date of Easter & other moveable holidays

Calendar Conversions

Scott Lee's free on-line service for converting to/from dates in Gregorian, Julian, French republican and Jewish calendars.

Calendar Converter

Converts dates between Julian, Gregorian, Hebrew and French Calendars and Julian Date.

Calendar Converter

Gregorian, Julian, Hebrew, Islamic, Persian, Mayan, French Republican, and more.

Calendar Form

Type in a month and year - future or past - and it returns a calendar of that month.

CalendarHome.com Calendar Converter

Convert between Old & New Style dates

Convertisseur français multi-calendrier en ligne

Convertisseur on-lin calendriers Julien, Grégorien, Hébreu, Musulman, Républicain Français, Civil Indien, Perse, Baha'i, Maya, Unix, Excel, ISO-8601.

Day of the Week Calculator

GEDCOM Date Calculator

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.

GeneaMichaud : Rubrique Téléchargements - Addin / Macro Excel calDate.xla

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.

Ian's English Calendar

Interactive calendar helps you calculate: Ecclesiastical Calendar, Old and New Style Dating, Day of the Week, Regnal Years.

Julian Day and Civil Date Calculator

Regnal Year Calculator

The Gregorian Calendar Conversion

Tom Nunamaker's Census Age Calculator

For UK census years.

Vivify: The GEDCOM Birth Date Estimator

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.