title: mysql query for date difference
body: <p>I have a table record where I am storing records of time like this:</p>
  
  <pre><code>login_time
  ---------------
  2010-12-08 13:40:57
  2010-12-08 13:28:57
  2010-12-08 13:10:57
  2010-12-08 12:01:57
  2010-12-08 11:05:57
  </code></pre>
  
  <p>I am using MySQL. I want to write a query to get all records which are less that "15 MINUTES" from current time.</p>
  
  <p>can anyone help me out writting that query?</p>