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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
These formulas are based on the observation that the day of the week progresses in a predictable manner based upon each subpart of that date. Each term within the formula is used to calculate the offset needed to obtain the correct day of the week. For the Gregorian calendar, the various parts of this formula can therefore be understood as follows:
The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. Converting a date between different calendars.
The Julian day is a continuous count of days from the beginning of the Julian period; it is used primarily by astronomers, and in software for easily calculating elapsed days between two events (e.g. food production date and sell by date).
The following has an example of converting a Julian ... / 24 end local function julian_date (date)-- Return jd, jdz from a Julian or Gregorian calendar date where ...
Method - 1 = the original calculation based on the Julian calendar 2 = the original calculation, with the Julian date converted to the equivalent Gregorian calendar 3 = the revised calculation based on the Gregorian calendar 4 = the revised calculation based on the Meletian calendar OUTPUTS: None.
Every year that fits into this section is a Julian leap year and a Gregorian common year. For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the right column. If converting from Julian to Gregorian, add the number from the "Difference" column. If converting Gregorian to Julian ...
The actual formula in the template drops all whitespaces shown here, as well as the "0" in "0.5". The constant 146097 is the number of days in 400 years (Gregorian calendar) The constant 36524 is the number of days in 100 years (Gregorian calendar) The constant 1461 is the number of days in 4 years (Gregorian calendar)