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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:
-- Negative Julian dates are not defined but they work. local calname = date. calendar local low, high-- min/max limits for date ranges −9999-01-01 to 9999-12-31 if calname == 'Gregorian' then low, high =-1930999.5, 5373484.49999 elseif calname == 'Julian' then low, high =-1931076.5, 5373557.49999 else return end local jd = date. jd if not ...
Julian dates: 2451545.0; Excel serial dates: 36526.5; As many decimal places may be used as required for precision, so 0.5 d = 0.500000 d. Fractional days are often calculated in UTC or TT, although Julian Dates use pre-1925 astronomical date/time (each date began at noon = ".0") and Microsoft Excel uses the local time zone of the computer ...
Going the other way, if we convert Feb. 19 Julian to Gregorian, the table says to add 12. Adding 12 on a Julian calendar gives Mar. 2, which is wrong. Adding 12 on a Gregorian calendar gives Mar. 3, which is right. So the existing table and instructions work correctly together, in both directions, if one always counts on a Gregorian calendar.
Subtracting that from 317 remainder days is 307; in other words, the 307th day of the year 644 CE, which is November 3. To summarize: the Long Count date 9.10.11.17.0 corresponds to November 3, 644 CE, in the Proleptic Gregorian calendar. To convert a Julian day to a Julian/Gregorian astronomical date (Proleptic Julian calendar before 46 BCE):
{{JULIANDAY.JULIAN|300|2|29}} returns 1830692 (first day of difference between the Julian and proleptic Gregorian calendars, in leap Julian year 300 AD, not leap in the proleptic Gregorian calendar) {{JULIANDAY.JULIAN|325|3|21}} returns 1839844 (spring equinox observed at the Christian First Council of Nicaea, taken as a reference for aligning ...
This template converts date elements, or date and time elements, into a Julian date timestamp. It interprets all dates starting at 15 October 1582 in the Gregorian calendar , otherwise it uses the Julian calendar that was valid until 4 October 1582.