Hey Alexey!

 AV> RFC-3339 compatibility looks more important to me.

Okay.  Please find one attached to the kludge section that follows rfc-3339 to
the letter and would be far more useful as a unique identifier given the
nanosecond part.

 AV> I can save much more by simply using KOI8-R instead of overbloated UTF-8.

Neither of which has anything to do with rfc-3339 given all the characters are
ascii (7-bit) as well as being universally accepted given the lack of alpha
characters.

For the record, none of this has anything to do with my original proposal other
than the proposed DateTime also contains no alpha characters and fits perfectly
into the specified field in fts-0001.016.

Life is good,
Maurice

... Blind byþ bam eagum se þe breostum ne starat.
    He is blind in both eyes who does not look with the heart.
--- GNU bash, version 5.1.0(1)-release (x86_64-motorshed-linux-gnu)