Highlight 'date' column by using CSS Styles


According to the tutorial: Conditional CSS Styles, I able to highlight the 'status' that is 'Closed', as below:

and the expression like this:
expression type="ClientScript" test="[status]=='Closed'" result="ExcludedFromGeneration"

My question is: How to highlight the 'expiry_date' which the date is smaller than TODAY?
For example:

Today's date: 4/13/2011, so that, the date 3/30/2011 should be highlight and remain others.
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