how to display a question on a Field Map Designer form, taking into account a time interval

[BéatriceDUMETZ]

Hi, 

as part of a form created with Designer, I would like question no. 2 to only be displayed 30 days after the response to the date field of question no. 1

do you have any idea how to do it ?
I tried DIFFDATE but it doesn't seem to work

[KenBuja]

In the Visible expression, this should display the field only when the date in the Date field is older than 30 days from today (and the Date field isn't empty)

iif(IsEmpty($feature.theDateField), false, DateDiff(Now(), $feature.theDateField, 'days') > 30)