Invalid dates in Japanese eras?

[Wáng Yifán]

>               <era type="186" start="1501-2-29"/>
>               <era type="187" start="1504-2-30”/>

lol that's funny; only the year in Julius calendar and the rest are
lunisolar. Are they only invalid ISO dates in that file (I mean, there
should be other Feb 29s if dates are consistently recorded in
lunisolar)?

> I cannot find any reference in TR35.

The Japanese WP has an exhaustive list:
https://ja.wikipedia.org/wiki/%E5%85%83%E5%8F%B7%E4%B8%80%E8%A6%A7_(%E6%97%A5%E6%9C%AC)


2021年9月8日(水) 18:45 Kip Cole via CLDR-Users <cldr-users at corp.unicode.org>:

>
> In supplementalData.xml, the era information for the Japanese calendar has two date entries which, in the Gregorian calendar, are not valid dates.
>
>               <era type="186" start="1501-2-29"/>
>               <era type="187" start="1504-2-30”/>
>
> How should these dates be interpreted? I cannot find any reference in TR35. Are they intended to be interpreted as dates in the Japanese traditional lunisolar calendar?  If so, what epoch is assumed for the Japanese calendar?
>
> Regards, —Kip
>
>
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