[Libreoffice-bugs] [Bug 144699] Use proleptic Gregorian consistently for *all* date formatting and recognition

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=144699

--- Comment #8 from Vollbracht <avollbracht at gmx.de> ---
ISO 6801 defines date conventions AFTER 1582 (and up to 9999) It explicitly
excludes dates prior to 1583 unless otherwise agreed. Actually there is an
agreement among astronomers to use Gregorian type dates prior to 1582 and even
a year 0 and negative years. But this is no standard in general at all. All
documents containing date values written in Occident between 1000 and 1500 use
Julian calendar. Still some conversion functions - GREGORIAN(<Julian type
date>), JULIAN(<Gregorian type date>) and ABURBE(<standard date after 755 B.
C.>) might help. They would be great to help compare astronomical and historic
data. ABURBE() would be very complex for date values prior to 709 a.u.c. / 45
B. C. due to 13 months scheme.

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