Why is my Java application using GMT instead of my OS timezone, and how can I fix it?

How to Resolve Incorrect Default TimeZone Issues in Java

In certain scenarios, Java applications may encounter issues where the JVM TimeZone defaults to GMT instead of the operating system (OS) defined timezone. This can lead to incorrect date and time handling.

One such instance is encountered with Java Development Kit (JDK) version 1.5 running on Windows Server Enterprise (2007). Despite specifying the Central timezone in the OS, the application returns a GMT time.

To address this issue, it is not necessary to modify the timezone from within the application. Instead, you can pass the following JVM parameter:

-Duser.timezone

For example:

-Duser.timezone=Europe/Sofia

This parameter sets the user-defined timezone for the JVM, overriding the default GMT timezone. Additionally, setting the environment variable TZ (on Linux) can also resolve the issue.

By specifying this parameter, you ensure that the JVM uses the OS-defined timezone, resulting in correct date and time handling in your Java programs.

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