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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.
{{JD|
year|
[month]|
[day]|
[hour]|
[minute]|
[second]}}
{{JD}}
{{JD|1582|10|05|11|59|59}}
returns 2299160.9999884 (this is the last valid instant of a Julian date before the Gregorian change, before noon, so actually it is still 4 October with the old date counting where days start at noon).{{JD|1582|10|15|12|00|00}}
returns 2299161 (this is the first instant of a Gregorian date, on 15 October at noon, i.e. 5 October at noon in the previous Julian calendar).{{JD|1582|10|15|11|59|59}}
returns 2299170.9999884 (this is still a date of the Julian calendar after the Gregorian change, and it is actually still the 14th of October before noon with the Julian calendar and the old Julian day counting system, or the 24th of October before noon with the proleptic Gregorian calendar and the old Julian day counting system where dates still changed at noon).{{JD|1582|10|25|11|59|59}}
returns 2299170.9999884 (this is still the same instant in the Gregorian calendar).the results may seem wrong, but they are not. The interpretation is given by comparing the Julian and Gregorian dates, so read twice the description of the third example; the exact calendar shift occurred between examples 1 and 2, and the 4th example is unambiguously in the Gregorian calendar.