Worldwide DST zones change very often and there’s no central authority coordinating it.
A country, or in some cases even a city, can decide if and how to apply or revoke it.
Everytime it happens, the change is recorded in the IANA Time Zone Database, and the update will be rolled out in a future release of the JRE.
We can force the modified Time Zone data containing the new DST settings into the JRE through Java Time Zone Updater Tool,