The settlement cycle for derivatives is T+1 day. In all the above scenarios, any gains / credits will be settled on T+1 day.
Margins released from squaring-off your Futures position or Short Option position can be used immediately to take other positions.
However, premium received from selling options can only be used to buy options on T-Day, you’ll be able to use for all other purposes from T+1 day.
Intraday profit will be available for trading on T+1 day when it is settled. Also, MTM profits from your futures position will be available for trading from the next day.
On T+1 day. You can check out this article for more information.
Yes, if T+1 day is a settlement holiday, the credits which you are to receive on T+1 day will be settled on the next working day.