Setting the national language

You can set the national language with the NATLANG runtime option or the CEE3LNG callable service. CEE3LNG is not supported in PL/I multitasking applications. The national language settings affect the error messages, month name, and day of the week name. Message translations are provided for the following languages:
ENU
Mixed-case U.S. English
UEN
Uppercase U.S. English
JPN
Japanese