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Julian day is a continuous count of days since the beginning of the Julian period, used mainly by astronomers and in software. Learn how to convert Julian day to Gregorian date, Julian calendar date, Julian date and fraction of a day, and the history of the Julian period and Julian date.
Learn how to convert dates between the Julian and Gregorian calendars using a visual example and a table of equivalent dates. The table covers the period from -500 to 2100 AD and shows the difference in days for each year.
The Julian calendar is a solar calendar of 365 days with a leap day every four years, proposed by Julius Caesar in 46 BC. It is still used for religious purposes in some parts of the world and differs from the Gregorian calendar by 13 days in the 20th century.
Learn about the calendar changes in Europe and the British Empire from Julian to Gregorian system, and the start-of-year adjustments from 25 March to 1 January. Find out how to use O.S. and N.S. notation for historical dates and events.
The Gregorian calendar is the calendar used in most parts of the world. It was introduced in 1582 by Pope Gregory XIII and has 365.2425 days per year, with leap years every four years except for centurial years divisible by 400.
A Julian year is a unit of time defined as exactly 365.25 days of 86 400 SI seconds each. It is used in astronomy as a constant measure of duration, not a calendar year, and is different from the Julian day number.
Learn about the non-repeating base-20 and base-18 calendar used by pre-Columbian Mesoamerican cultures, especially the Maya. Find out how it counts days from a mythical creation date, how it uses zero and Mesoamerican numerals, and how it is written on monuments.
Zeller's congruence is an algorithm to calculate the day of the week for any Julian or Gregorian calendar date. It uses formulas based on the day of the month, the year, the century and the month number.