Why would tick add a year here?
(tick/format (tick/formatter "YYYY/MM/dd")
(tick/zoned-date-time #inst "2024-12-29T05:00:00.000-00:00")
=> "2025/12/29"
You probably want yyyy rather than YYYY unless you specifically want a week-based year. See here for more details: https://docs.oracle.com/javase/8/docs/api/java/time/format/DateTimeFormatter.html