Internal moment-timezone data is 2019a
update to recent data to avoid timezone errors due to recent policy changes (ex: Brasil no longer follow DST)
file can be manually updated:
https://www.zkoss.org/wiki/ZK_Configuration_Reference/zk.xml/The_Library_Properties/org.zkoss.zk.moment.timezone.path
ZK-5238 upgrade moment.js to eliminate the security vulnerabilities
ZK-5434 Datebox show different time when running with -Duser.timezone="America/Mexico_City"
ZK-4656 Update moment-timezones-with-data.js (tzdata 2020a)