title: update DateTime value in Table using SQL
body: <p>How can we update datetime value in a column using sql</p>
  
  <p>say, if we want to update any of datetime values by adding an hour or 5 minutes etc.</p>
  
  <pre><code>UPDATE TableLastCalls
  SET [NEXT_UPDATE_TIME] =  ?? // want to add an hour
  </code></pre>