i’ve add two more math column for start and end date.
But still the same.



add plus 0 to math columns… you have just column in equations… that makes column a text
Which column, Uzo ?
Okay.
Let me first restate your requirements in my own words, so that I can be sure that my understanding is correct.
You want to count the number of days between a given start and end date, with the following caveats:
Is that correct?
Additional:
why is that matter? date is a date… and is represented by a number… glide is plus 0.5 to google sheets … so you need to do conversion in GS

When the math column adding with zero it is empty.

But if you say so, why Darren did well ? In earlier post . Very smooth
that means your source is not a date format
How to see the apps working ?
??? what do you mean?
the builder haha
builder is not a deployed app… so it will work as a in app… you have to test it on defernt devices and OS