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  2. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the

  3. Ab urbe condita - Wikipedia

    en.wikipedia.org/wiki/Ab_urbe_condita

    Prior to the Roman state's adoption of the Varronian chronology – created by Titus Pomponius Atticus and Marcus Terentius Varro – there were many different dates posited for when the city was founded. This state of confusion required, for one to use an AUC date, one to pick a date as canonical.

  4. Dominical letter - Wikipedia

    en.wikipedia.org/wiki/Dominical_letter

    For Gregorian dates after 2299, the year in the table which differs by an exact multiple of 400 years should be used. The values "r0" through "r6" indicate the remainder when the Hundreds value is divided by 7 (Julian) or 4 (Gregorian), indicating how the series extend in either direction. Both Julian and Gregorian values are shown for years ...

  5. Byzantine calendar - Wikipedia

    en.wikipedia.org/wiki/Byzantine_calendar

    'Roman year since the creation of the universe', abbreviated as ε.Κ.), was the calendar used by the Eastern Orthodox Church from c. 691 to 1728 in the Ecumenical Patriarchate. [ 2 ] [ note 2 ] It was also the official calendar of the Byzantine Empire from 988 to 1453 and it was used in Russia until 1700.

  6. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  7. Lilian date - Wikipedia

    en.wikipedia.org/wiki/Lilian_date

    Lilian dates can be used to calculate the number of days between any two dates occurring since the beginning of the Gregorian calendar. It is currently used by date conversion routines that are part of IBM Language Environment (LE) software [2] and in IBM AIX COBOL. [3] The Lilian date is only a date format: it is not tied to any particular ...

  8. 85 BC - Wikipedia

    en.wikipedia.org/wiki/85_BC

    Year 85 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Cinna and Carbo (or, less frequently, year 669 Ab urbe condita ). The denomination 85 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming ...

  9. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The Roman calendar was the calendar used by the Roman Kingdom and Roman Republic. Although the term is primarily used for Rome's pre-Julian calendars, it is often used inclusively of the Julian calendar established by the reforms of the Dictator Julius Caesar and Emperor Augustus in the late 1st century BC.