Typically, you use the normal release/build upgrade process for a JACE to update its historical time zone database. However, in cases where an updated version of this database becomes available, and you want to maintain the current build in an AX-3.3 or later JACE, you can simply transfer the newer timezones.jar file to the host's !lib folder.

As when making changes to the timezones.xml file in an earlier rev. host (pre-AX-3.3), after updating the historical time zone database files, you must restart the station on that host for the updated time zone database to become effective.