Is there some kind of rules regarding changing market date and settling market?

I first try to settle the market right away but got an error "XError: Settling Date not reached".
I figure is probably because the closing date and settle date is in the future so I try to change the market date with the API.
I tried with different dates ahead/behind of current time but all of them give me this error "XError: You are not allowed to do that"
Am I missing something here?

Thanks