My gut feeling is that you need to provide a timezone somehow

(tick/format (tick/formatter "yyyy") (tick/instant (tick/in (tick/date-time "2022-09-08T20:26") (tick/zone))))

Does this work? (tick/format :iso-instant (tick/instant))

And does this? (tick/formatter "yyyy")

Oh, looks like I found something useful )

ah, that is really nice!