Evgeny, does that fix the error that you see?

>> BTW I just noticed that decoded-time-set-defaults was mistakenly
>> announced in NEWS as encoded-time-set-defaults - should that be fixed on
>> emacs-27 or master?
>
> Master, I guess.

Done in 3d276324ed.

>> > However, I'm not sure I understand the idea behind your
>> > my-mins-between: how did you expect Emacs to guess the year you had in
>> > mind?
>> 
>> The year doesn't matter, since my-mins-between cares only about the
>> relative difference between strings of the form "HH:mm", i.e. the hours
>> and minutes fields.
>
> Yes, it does matter: see the comment by Andreas.

In general, sure, but perhaps not in Evgeny's specific use case as
described in https://bugs.gnu.org/48290#11.

Thanks,

-- 
Basil