ZIUpdater Time Zone Tool

Keep Java Time Zones Up-to-Date With ZIUpdater

ZIUpdater is an open source tool developed by Azul that provides the ability to update the IANA time zone definitions for any installed Java instance.

Download

ZIUpdater provides a functional subset of the equivalent Oracle tool TZUpdater.

  • The current version of ZIUpdater updates the time zone information obtained from any downloaded copy of the IANA time zone database.
  • ZIUpdater performs a compilation step, transforming the IANA database into a JDK-compatible file set, then applies it to the file tree of the invoked JDK/JRE.
  • You may use ZIUpdater on any platform (Windows, Linux, macOS, etc.) where you have installed Java 8 or Java 7.
  • By design, it works with Zulu Enterprise, Zulu Community, Zulu Embedded, and Zing, but ZIUpdater has also been successfully tested against OpenJDK and Oracle JDK.

To be precise, ZIUpdater works as a JAR file utility that operates against the Java installation of the JRE that invokes it. It compiles tzdata source information into files in binary format and puts these files into the Java installation directory.

For Java 8 and later, the source data is compiled into a single file placed at:
<java.home>/lib/tzdb.dat
For Java 7 and earlier, the source data is compiled into multiple files placed at:
<java.home>/lib/zi

ZIUpdater can be used with the any version of time zone database available from IANA converted to rearguard format. See Using the Time Zone Updater Tool for details.

Download ZIUpdater

The ZIUpdater tar.gz file includes the tool JAR file, a README with instructions, and associated open source licenses. ZIUpdater was released by Azul Systems to provide an unencumbered binary under an open source (GPLv2 with Classpath Exception) license.

GPLv2 License version 1.0.2.2

in tar.gz file format, 19 July 2019.

.TGZ

How to install

Unzip the download package, and run the JAR file against the Java installed set at your JAVA_HOME location.
$JAVA_HOME/bin/java -jar ziupdater.jar -l file://[path]/tzdata.tar.gz

For more information on how to run ZIUpdater, current version details, and other notes, please refer to the enclosed README file and Using the Time Zone Updater Tool.

As a reminder, please note that every Zulu and Zing release ships with the latest IANA time zone data files available at the time of release. Therefore updating your JDK/JRE and using ZIUpdater remain complementary actions; both are suitable tactics to ensure you are using the latest time zone definitions.

Please send questions/problems/source snapshot requests to tools@azul.com

© Azul Systems, Inc. 2019 All rights reserved.