ysth
It looks to me like none of the mariadb or mysql servers have timezone data loaded. This breaks any sql that uses IANA timezones, such as https://dbfiddle.uk/pm4YuFlm:
select convert_tz(utc_timestamp,'+00:00','America/New_York')
It would be really helpful if this worked.
See:
https://mariadb.com/kb/en/mariadb-tzinfo-to-sql/
https://dev.mysql.com/doc/refman/8.4/en/mysql-tzinfo-to-sql.html