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Struts 2 - comparing dates in validation

 
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Hello:

I have a form with a begin date and end date and I want to make sure the begin date comes before the end date. Something like the following:

<validator type="expression">
<param name="expression">begin_date < end_date</param>
<message>The begin date must precede the end date</message>
</validator>

But I don't know the syntax. How would this be done?

Thanks
Eric
 
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