(iSeries)

Set the same time zone for all of our JVM processes

We can set the same time zone for all of the JVM processes running on the IBM i server.

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

In some application environments, it is important that all of our JVM processes use the same time zone. If this is your situation, before starting the application servers, we can either update the user.timezone property in the SystemDefault.properties file for our IBM i server or configure a locale for that server:

Tasks

1. Update the user.timezone property in the SystemDefault.properties file for our IBM i server

   Important: The value we specify for the user.timezone property overrides any system locale setting we create.

   1. Edit the SystemDefault.properties file located in the /QIBM/UserData/Java400 directory. If the file does not exist, create a SystemDefault.properties file in that directory.

   2. Change the value specified for the user.timezone property to the correct time zone. If this property does not exist, add it to the file.

      The syntax for setting the property is user.timezone=timezone, where timezone is the supported value for the appropriate time zone.

      The Java virtual machine (JVM) calculates the time based on the value of the user.timezone property and the QHOUR and QUTCOFFSET system values. QUTCOFFSET represents the number of hours' difference between the system's time zone and Greenwich Mean Time (GMT). The JVM adds the values of QHOUR and QUTCOFFSET to calculate GMT, and then uses GMT and value of the user.timezone property to derive the correct time.

   3. Save change.

2. Configure a system locale for our IBM i server.

   If a value is specified for the user.timezone property in the SystemDefault.properties file, it overrides this system locale setting.

   1. Create a locale source file.

      Run the Create File (CRTF) command to create this file from the LOCALSRC file in the QSYSLOCALE library.

   2. Edit the source file by running the Start SEU (STRSEU) command.

   3. Specify a time zone in the file.

      The source file also contains settings to indicate when daylight savings time begins, when it ends, and how much time to add or subtract. The Java virtual machine ignores these settings and reads only the TNAME time zone field. The value of TNAME must match the name of a Java time zone value.

   4. Create the locale by running the Create Locale (CRTLOCALE) command.

   5. Edit the user profile to use the new locale.

      To change the user profile under which the application server runs, run the Change User Profile (CHGUSRPRF) command.

   6. Save changes.

All of the JVM processes running on the IBM i server use the same time zone.

What to do next

Start the application servers.

Set the time zone for all of the application servers running under a user profile

Time zone IDs that can be specified for the user.timezone property