Posts: 3,283
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Joined: Jul 2005
Try a date before the switch-over date. The Julian day should be different only between 1582 and 1752.
Posts: 850
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And so it should.
The implementations depend on finding the JD for years before 1582 and 1752, when the Gregorian Calendar was adopted, depending on country.
Perhaps the "notes" in the following reference will shed some light on the subject.Julian Date Converter
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Sure - you will get the same result for any date after 1752. ;-)
In 1582 pope Gregory XIII introduced the calendar we still use today - the Gregorian calendar. The official switch date was Friday, 15 October 1582 which followed directly on Thursday, 4 October. The dates inbetween are not defined.
While the new calendar was adopted in many countries (e.g. most of Europe) in 1582 or shortly after, the British Empire did not do so before September 1752. So the years between 1582 and 1752 will cause different results because the countries that had switched early already had the Gregorian calendar while in the British Empire still the old Julian calendar was valid.
Before this flag was introduced the 34s generally assumed a switch in 1752, i.e. the date valid only for the British Empire. Today at least the official (and IMHO only correct) date can be set. Users in countries that did not adopt the Gregorian calendar on these two dates will only get correct results for dates after the one their country switched.
Dieter
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These settings also impact the other date functions not just the J-D and D-J ones.
- Pauli