How to add extra shifts on a nonworking day

Summary:

Customer has a 6 days working for plant. Sat-Thursday with Friday off. Based on the demand, the planner reviews the capacity and then they plan the production even on Fridays (normally a off day). How can we add these exceptions in the resource availability.

I tried with resource exception, by overriding the resource availability from 0 to 1. The resource availability s updated in planning, but it still does not mark the off day as a Work Order start or end date.

Do we need to update the calendar each time. Is there something the planner can do, as the calendar setup is in FSM, for which a planner would not have access.