title: SQL OVERLAPS operator problem, how to get rid of it
body: <p>I expect that date period from '2011-01-28' to '2011-02-01' OVERLAPS period from '2011-02-01' to '2011-02-01' (that's the same day here), but it does not! </p>
  
  <p>PostgreSQL expecting the match of exact ending point is NOT a match...how to get rid of this? I would like to have it treat the above scenario as overlap.</p>
  
  <pre><code>SELECT (DATE '2011-01-28', DATE '2011-02-01') OVERLAPS
         (DATE '2011-02-01', DATE '2011-02-01');
  </code></pre>
  
  <p>returns false, while I expect it to return true.</p>