AND / OR conditions in availability

[Jelmer]

The availability of appointments is very limited. Let's say I have the following conditions for my availability:

• IF January till march THEN False
• IF October till december THEN False
• IF (April till May OR September) AND Wednesday till Sunday THEN 11:00 - 17:00
• IF June till August AND Monday till SundayTHEN 11:00 till 17:00

Currently I have no clue how to get these conditions in the availability list.

Is it possible to add some sort of AND / OR conditions?