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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:
A date, with an optional time, can be specified in a variety of formats, and can be converted for display using a variety of formats, for example, 1 April 2016 or April 1, 2016. The properties of a date include its Julian date and its Gregorian serial date, as well as the day-of-week and day-of-year.
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 ...
-- 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 ...
A commonly used value in Lilius's time, from the Alfonsine tables, is 365.2425463 days. [13] As the average length of a Julian year is 365.25 days, the Julian year is almost 11 minutes longer than the mean tropical year. The discrepancy results in a drift of about three days every 400 years.
A duration including the second date is calculated if |duration=on is used. {{age in years and days|1 Jan 2011|31 Dec 2012}} → 1 year, 365 days {{age in years and days|1 Jan 2011|31 Dec 2012|sep=and}} → 1 year and 365 days {{age in years and days|1 Jan 2011|31 Dec 2012|duration=on}} → 2 years, 0 days
In the template, before 1582, the Julian year is the same as the Gregorian year. It is possible to improve the template to show the number of days difference when the Gregorian calendar was proleptic, as in conversion between Julian and Gregorian calendars, but this was not done. Obankston 07:19, 25 March 2012 (UTC)