title: Can I use the Firebird DateAdd function in the Where clause?
body: <p>In firebird can I use the <code>DateAdd</code> function in the where clause?
  I have the following sql;</p>
  
  <pre><code>select
    s.number,
    s.warranty_start
  from
    serial_number s
  where
    s.warranty_start &gt; dateadd(year, -3, 'now')
  </code></pre>
  
  <p>I get error;</p>
  
  <pre><code>expression evaluation not supported
  </code></pre>