I'm with one challenge that after lots of research I didn't found a solution yet and I need help. I need to implement a 13 period calendar solution (normally used in Financial institutions) in one SharePoint farm. Basically all SharePoint site collections must work not with Gregorian calendar type but with 13 Period calendar in (Lists, Calendar Views, etc).
How can I implement this? Is possible to create a new calendar type in SharePoint?
Thank You in advance.