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1 Ιαν 2024 · This free date calculator computes the difference between two dates. It can also add to or subtract from a date. Both can deal with business days and holidays.
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Days between dates. Historically accurate version. • The Muslim calendar. The Gregorian calendar conversion.
Welcome to Fourmilab 's calendar converter! This page allows you to interconvert dates in a variety of calendars, both civil and computer-related.
Change civil date to calculate Julian Day Number and day-of-week, or vice versa. After changing a text box, click outside of the calculator, or press tab, to update all other data. (Don't press return.) Auto mode is used, meaning that the civil calendar changes from Julian to Gregorian between 1582 October 4 and 1582 October 15.
Use this converter to calculate dates in the Julian and Gregorian calendars. You can also calculate the Julian day, also known as “Julian date” and “JDN”, as well as make calculations of the date after the founding of Rome (in Latin, “ab Urbe condita”).
The Gregorian calendar, also called the Western calendar and the Christian calendar, is the internationally accepted civil calendar. It was introduced by Pope Gregory XIII, after whom the calendar was named, by a decree signed on 24 February 1582; the decree, a papal bull, is known by its opening words, Inter gravissimas.
The calculator below transforms the date from the Gregorian calendar to Julian and vice versa. It's easy to use - enter the date, and it will show Julian and Gregorian calendar dates. Also, there was no Gregorian before 15th October 1582, so you can't tell the date before.
