>>>I would like to have a view parameter that works like a logical, but uses a date field. I have a date field that is either empty or has some value. I would like to bring down the records that are either empty or have some value (regardless of what the value is). Is there some way I can set up a view paramter off of the date field to provide this functionality, or do I need to create another logical field?
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>>It's enough to use datefield equal {} (or NOT equal {}).
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>How do you do that in a view parameter? You can't set the value of a view parameter to an expression.

Why do you use 'expression'. You should just select datefield as 'Field Name' (View Designer: Selection Criteria tab), and type {} in 'Example'.