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This page allows you to interconvert dates in a variety of calendars, both civil and computer-related.All calculations are done in Java Script executed in your own browser; complete source code is embedded in or linked to this page, and you're free to download these files to your own computer and use them even when not connected to the Internet.The calendar thus accumulates one day of error with respect to the solar year every 128 years.

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When comparing historical dates, it's important to note that the Gregorian calendar, used universally today in Western countries and in international commerce, was adopted at different times by different countries.

Britain and her colonies (including what is now the United States), did not switch to the Gregorian calendar until 1752, when Wednesday 2nd September in the Julian calendar dawned as Thursday the 14th in the Gregorian.

If you add the additional rule that years evenly divisible by 4000 are leap years, you obtain an average solar year of 365.24225 days per year which, compared to the actual mean year of 365.24219878, is equivalent to an error of one day over a period of about 19,500 years; this is comparable to errors due to tidal braking of the rotation of the Earth.

Astronomers, unlike historians, frequently need to do arithmetic with dates.

Since no such objects existed prior to October 4, 1957, all satellite-related MJDs are positive.

The Julian calendar was proclaimed by Julius Csar in 46 The Julian calendar differs from the Gregorian only in the determination of leap years, lacking the correction for years divisible by 100 and 400 in the Gregorian calendar.

But the Julian day notation is so deeply embedded in astronomy that it is unlikely to be displaced at any time in the foreseeable future.

It is an ideal system for storing dates in computer programs, free of cultural bias and discontinuities at various dates, and can be readily transformed into other calendar systems, as the source code for this page illustrates.

In the Julian calendar, any positive year is a leap year if divisible by 4.

(Negative years are leap years if the absolute value divided by 4 yields a remainder of 1.) Days are considered to begin at midnight.

As in the Julian calendar, days are considered to begin at midnight.

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