Regional Settings schema
Applies to: SharePoint 2016 | SharePoint Foundation 2013 | SharePoint Online | SharePoint Server 2013
The Regional Settings schema is used to define the time zones, locales, languages, and currencies implemented within a SharePoint Foundation deployment. This schema is expressed primarily through two files located in the setup directory, RGNLSTNG.XML (%ProgramFiles%\Common Files\Microsoft Shared\web server extensions\15\TEMPLATE\1033\XML) and TIMEZONE.XML (%ProgramFiles%\Common Files\Microsoft Shared\web server extensions\15\CONFIG).
You can access or modify regional settings through various members of the following classes in the Microsoft.SharePoint namespace:
Regional Settings elements