![]() ![]() The following example shows the typical result of the dump command. usr/bin/od -c -j 11 -N 11 /lib/zi/ZoneInfoMappings The following example shows the octal dump command format. On the Oracle Solaris, Linux and Mac macOS operating systems, you can use the octal dump command to see the header of this file. This data is stored in a binary format that is specific to Java. You can download the tzupdater tool from this web page: Timezone Updater Tool.Įxamine the ZoneInfoMappings File: Even without the tzupdater tool, you can quickly check the version by examining the header of the file /lib/zi/ZoneInfoMappings. Here is a typical output from running the tzupdater tool. To determine the time zone database version of your JRE, run this tool as follows: The following sections describe troubleshooting techniques for time zone settings.ĭetermine the Time Zone Data Version in Useĭetermine the Time Zone with TZupdater: The Java time zone updater tool is called tzupdater. Operating system-specific patches might be required to ensure that the correct system time is delivered to the JRE. Then, if a Java application requests the system date by calling date and time related constructors, the system time is returned.Ĭonstructors related to date and time include: Modifications to the JRE for each specific operating system are necessary so that the operating system can deliver the system time to the JRE. The tzupdater tool is available for download from the Java SE Download Page. The Java time zone database supports time zone IDs and determines daylight saving time rules for all the time zones that the JRE supports. This provides cross-platform support because the different operating system APIs are not sufficient to support the Java APIs. ![]() ![]() However, the JRE also maintains its own time zone database. The JRE reads the native time zone information to determine your default time zone.įor example, on Windows, the JRE queries the registry to determine the default time zone. ![]()
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