title: Check date value in Netezza
body: <p>IN Netezza , I am trying to check if date value is valid or not ; something like ISDATE function in SQL server. </p>
  
  <p>I am getting dates like 11/31/2013 which is not valid, how in Netezza I can check if this date is valid so I exclude them from my process. </p>
  
  <p>Thanks </p>