Hi @StephaneVedren ,
Could you please share a bit more about the Calculated field in your SP list? Do you set the date type returned from this Calculated field as Number?
Further, do you want to remove the infinite '0' from the Calculated field value?
Based on the needs that you mentioned, I think the Round function could achieve your needs. I have made a test on my side, please take a try with the following workaround:
Unlock the Calculated Field data card in Edit form, set the Text property of the Label within the Calculated Field data card to following:
Round(Value(Parent.Default), 0)
More details about the Round function, please check the following article:
Round function
Best regards,