I know you can set the default language when you create a site collection using powershell. However, if you don't specify this, it uses a default value. Where is this default value set?
I can't see anything in the SharePoint installation process for setting this? We are in Australia, but a lot of site collections are created with EN-US as the language. This has the effect of setting the locale settings to English - United States, which uses the "wrong" date format.