Change the time zone choice list
Wherever users have a choice of time zone, the choices are populated using the Time Zone choice list on the User [sys_user] table. Not all time zones appear by default.
About this task
To add or remove time zones from the list of time zones:
Procedure
Navigate to All > User Administration > Users and open any user record, or click New.
Notice that the default time zone is System (America/Los_Angeles).
Right-click Time zone, and then select Personalize Choices.
Highlight the desired time zone from the Available or Selected lists, and then Add or Remove the time zones as needed.
Parent Topic:Using time configuration