You can ensure that your application components use the correct time zone. How you do this varies by the operating system on which WebSphere Application Server is installed and, in some cases, by the scope required.
If you set your application servers to a North America time zone, review the Technote Changes to Daylight Saving Time will affect IBM WebSphere Application Server and its associated Operating Systems and make sure that you have applied the service updates required to support the changes the United States and Canada are making to the start and stop dates for Daylight Savings Time.
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, you might specify EST5EDT for Eastern Standard Time, Daylight Savings Time.
When the East African Time Zone (EAT) is specified as your
time zone setting, the HP-UX operating system Java virtual machine
(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
you need to 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.
To change the time zone setting for a single application server: