The language environment variable establishes not only the language used for the Oracle Forms interface (both Developer and Runtime), but also the set of default format masks used to display that data, unless explicit format masks override the default. As an application developer, you also have additional NLS-related format mask characters available if you choose to override the default display masks.
All data input into Oracle Forms or the application will use the default format masks associated with the specified territory, so you can change languages when building an application as well as when running it, without needing to change the date and number formats.
Specifically, Oracle Forms uses the default format masks:
While working with date and currency fields for multilingual applications, you will want to consider: