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comparing dates

 
Greenhorn
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I have two dates A and B on a form. Date A is displayed while I entering date B. If date B is prior to date A, it has to show valid error message when I submit the page. I want to use <logic> tag for this comparison and error message. How to go about it? Code snippet is appreciated.

Akshaj
 
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On Submit you can call JAVAScript and in Java script you can do all comparing.
 
Consider Paul's rocket mass heater.
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