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Checking availability for multiple dates



I am trying to check if a room is available for multiple dates. If so, the room may be shown in a gallery.
'Lijst_Reservaties_ Zalen /lokalen’ is the list containing all rooms.

'ListReservations' is the list of all reservations. In 'ListHerhaling' I have put all the data that the user has selected and which must therefore be checked.

Van is the column in 'ListReservations' that contains the start date and time.
Start is the column in 'ListHerhaling' that contains the start date and time in text format.
Tot is the column in 'ListReservations' that contains the end date and time.
Eind is the column in 'ListHerhaling' that contains the end date and time in text format.

My code at the 'Items' property of the gallery:

Filter('Lijst_Reservatie_Zalen/lokalen'; Not(ID in Filter(ListReservations; 
CountIf(ListHerhaling; (
    (Van >= Value(Start) && Tot <= Value(Eind)) || 
    (Van < Value(Eind) && Tot >= Value(Eind)) || 
    (Van < Value(Start) && Value(Start) < Tot))) > 0).ID_Zaal))


I have already tried everything but I don't find it. I would be super grateful if you could help me.

Thank you! 

Super User
Super User

@JolienS Could u please tell what's the difference between your ListReservations' and 'ListHerhaling' table?

New Member

Hi @CNT 


The 'ListReservations' is a table with all reservations already booked for all rooms by all users.

It is the intention that several moments can be reserved at once. To give an example, the start date entered is 18/05 and the end date 8/06 and the user wants the reservation to repeat every other week. 18/05, 25/05, 01/06 and 8/06 are then stored in 'ListHerhaling' with a start and an end date and time. So 'ListHerhaling' is a collection that I use to store all dates.

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