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Learn how to convert dates between Julian and Gregorian calendars using a visual example and a table of equivalent dates. The table covers years from -500 to 2100 and shows the difference in days between the two calendars.
The algorithm enables a computer to print calendar and diary pages for past or future sequences of any desired length from the reform of the calendar, which in England was 3/14 September 1752. The article Date of Easter gives algorithms for calculating the date of Easter. Combining the two enables the page headers to show any fixed or movable ...
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 since 1582. It is a modification of the Julian calendar that corrects the drift of the equinoxes and adds a leap day every four years, except for centurial years divisible by 400.
A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future. Learn about the different types, uses, and algorithms of perpetual calendars, and their relation to the Gregorian and Julian calendars.
Julian day is the continuous count of days since the beginning of the Julian period, used mainly by astronomers and in software. Learn how to calculate Julian day number and date, and the different variants of Julian date in astronomy and other fields.
A calendar is a system of organizing days by giving names to periods of time, such as days, weeks, months and years. Learn about the etymology, history and types of calendars, from lunar and solar to lunisolar and modern.
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.