Metadata card Rules - can I filter based on a date property?

I want to hide a property on the metadata card if the prior property, which is a date, is blank.  In the rule I try to add, I would filter by DateProperty is Null, however it appears you cannot filter within a rule by a property of type Date.  Can anyone think of a work around for this?

I have another use case - When a document of a certain class is added to a vault, I want property2 to be required if property1 is filled in.  This is an easy metadata card fix.  However, property 1 is of type Date.  I don't see to have that as an option to filter for rules.  How are others handling this?