Critical : How to create new calendar type in sharepoint ?

Question

I had trouble to find any useful resource for my issue about how to create new calendar type or change calendar type algorithm (gregorian calendar or other types) in sharepoint, my purpose is add new calendar type to sharepoint standard calendar types (which exists in regional settings page).
Can anybody help me about this issue ?
Any idea would be appreciated.

Note : This issue is very very critical for me.