Change time zone settings

In some application environments, it is important that application server components use the same time zone. We can use the console or system environment variables to ensure that the application components use the correct time zone.

(iseries) Verify that extended National Language Support (NLS) is installed on the i5/OS server. If extended NLS support is not already installed, install it by selecting option 21 when you install the base operating system (5769-SS1).

Determine the scope at which to set the time zone value. We can set the time zone value such that is applies for an entire cell, for an entire node, or only for a specific server.

Remember that time zone IDs should include an offset and, in almost all cases, a daylight saving time zone name for consistent results. For example, specify EST5EDT for Eastern Standard Time, Daylight Savings Time.

When the East African Time Zone (EAT) is specified as the time zone setting, the HP-UX operating system JVM uses Greenwich Mean Time (GMT). Therefore, log file time stamps are based on GMT instead of EAT. The situation might also causes problems in server federation if you attempt to synchronize with servers that are running on an operating system whose JVM correctly handles the EAT.

If use East African Time Zone as the time zone setting for a specific function, instead of using the following procedure, add the -Duser.timezone=EAT parameter to the appropriate Java command. For example, to have an application server use EAT as its time zone setting, add the -Duser.timezone=EAT parameter to the startServer command.

In general cases, the time zone for application server is inherited from the time zone set for the operating system; Java should be inherit the time zone from the operating system, and the application server will use the time zone set for each Java Virtual Machine (JVM). If we need to configure a different time zone for a single JVM, we can set the TZ environment variable in the application server, modify the properties file, or specify a command-line parameter when the JVM starts.

(dist) We can use the TZ environment variable to set the time stamps for the application logs.

(zos) We can specify the Unix System Services (USS) TZ variable as an environment variable to set the time stamps for the application logs.

(iseries) We can change the time zone setting for the application logs for all of the processes running in a single application server, for all of the application servers running under a user profile, or for all of the JVM processes running on the WAS subsystem.


Your new time zone setting are in affect for the designated servers.


Related tasks

  • WebSphere variables