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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.
Julian day is the continuous count of days since the beginning of the Julian period, used mainly by astronomers. Learn how to calculate the Julian date and its variants, such as reduced, modified, truncated, Dublin, CNES and CCSDS Julian days.
Learn about the calendar changes in Europe from Julian to Gregorian system, and how to use Old Style (O.S.) and New Style (N.S.) notation. Find out how Britain and its colonies adopted the Gregorian calendar in 1752, and how to adjust the dates accordingly.
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 how and when different countries and regions adopted the Gregorian calendar, a reform of the Julian calendar to correct the error in the date of Easter. Find ...
Thus there is no simple way to find an equivalent in the proleptic Julian calendar of a date quoted using either the Roman pre-Julian calendar or the Julian calendar before AD 8. The year 46 BC itself is a special case: because of the historical introduction of the Julian calendar in that year, it was allotted 445 days.
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.
The Revised Julian calendar is a proposed alternative to both Julian and Gregorian calendars, adopted by some Eastern Orthodox churches and nations. It differs from the Gregorian calendar in the leap year rule, and from the Julian calendar in the century years.