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.

BCG Skillbuilding: Date Calculations

Calculate the date of Easter & other moveable holidays

Calendar Calculator

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 de Calendriers

Day of the Week Calculator

Determining Time between Two Events in One Step (or Determining Birthdate from Deathdate and Age)

Estimate Life Events Dates

Javascript utility page. Input current age or year of birth, U.S. high school or college graduation or death. It generates a web page with charts showing estimated year of births, graduations, deaths for that person and parents. Assumes all dates are 31 December.

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 T

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

Keisan Online Calculator

Time (different conversion times), Date (age, various date conversions, leap year generator & checker), Western Calendar (Julian and Gregorian Calendar, Julian day number from date, Date from Julian day number, Easter Calendar & Calendar with week number), Other Calendars (Hijri, Prayer time, Iranian, Hebrew & Mayan Calendars).

Kirchenkalender.com - Feiertage im deutschen Kirchenjahr von 900 bis heute / Holidays in the German church year from 900 to today

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.

Parallax View - Date-and-Duration Calculator

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.