date value is not null

I'm making an interface form with Appian. I'm making the form interactive. A textbox should only appear when specific variables are true. Appian offers a wonderful feature for this where you can add an expression to a "only show when" function.

It presently holds the following expression:

edate(today(), -804) >= ri!GeboorteDatum

The variable on the form is ri!geboortedatum.

Another statement that says: only show when the date value is not null is required. I tried everything but nothing worked. Is there a solution? The programming language appears to be similar to Microsoft Excel.

Perhaps something like

edate(today(), -804) >= ri!GeboorteDatum & isnull(ri!Geboortedatum)

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