How to get region Format in javascript

I am looking for a way to get the region format of user machine from pure js. This is not the current language (I can get it from navigator.language) but the format user using.

Eg: User machine language : English ("en-us") User machine region format : Norwegian Bokmal (Norway) So machine use English and use bokmal for formatting.

I need to get this User machine format

Please help me.