Gregorian Calendar in Sandbox World Builder System

[Fenlander216]

I have tried to use the Gregorian Calendar for a game set in the World of Darkness. But each time I set up the calendar and save it then leave the world, it resets itself to default when relogging back into the world.

I have the WFRP game set up and working with the Imperial Calendar and that is fine, so I think it has something to do with the Gregorian version.