Eli Zaretskii <eliz@gnu.org> writes:

>> From: "Basil L. Contovounesios" <contovob@tcd.ie>
>> Cc: Евгений Михайлов
>>  <lewwadoo@gmail.com>,  48298@debbugs.gnu.org
>> Date: Sun, 09 May 2021 09:19:47 +0100
>> 
>> > I guess the problem is in decoded-time-set-defaults, if anywhere.
>> 
>> Lars?
>
> As the minimum fix, perhaps instead of using zero as the missing year
> we should use 1970, as zero could not be representable on some
> systems.

Also 1970 is implied by the function's docstring and announcement.

All tests seem to pass with this: