I am not a programmer and started with building my first app. What the app is doing currently: saving and collecting hotel-nights in firebase.
I am able to display, edit and delete data so far, but I have no knowledge on how to handle the json differently than displaying the data.
How, for example could I calculate “checkout-date” - “checkindate” and display thus the nunber of nights I stayed in the hotel? So far I save the values as a string.