Invalid dates in Japanese eras?
edward.welbourne at qt.io
Thu Sep 9 04:39:45 CDT 2021
Wáng Yifán (09 September 2021 05:07) wrote:
> [...] I couldn't find the exact definition of "extended Gregorian year" elsewhere.
My semi-educated guess is that "extended Gregorian year" means the year
that the relevant date would fall in, in the "extended Gregorian
calendar" - i.e. the Gregorian calendar extrapolated backwards, if
necessary, to before Gregory introduced it.
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