title: Date Error Invalid Number
body: <p>I would like to add 10 minutes to sysdate, </p>
  
  <pre><code>select to_char(SYSDATE,'dd-Mon-yyyy hh:mi:ss') + 10/1440 from dual
  </code></pre>
  
  <p>when I tried the above I got the error</p>
  
  <pre><code>ORA-01722: invalid number
  </code></pre>