title: find if date is older than 30 days
body: <p>The date string looks like this</p>
  
  <p><code>2011-08-19 17:14:40</code></p>
  
  <p>(year-month-day  hours:minutes:seconds)</p>
  
  <p>How can I find out if the date is older than the current date with more than 30 days?</p>