title: Use date in mysql database instead ID
body: <p>How is smart to use date as primary value instead ID?</p>
  
  <p>Where I can get better search mysql database performace:</p>
  
  <pre><code>to use timestamp: 1394319600
  or to format date and use it as: 09032014 
  </code></pre>
  
  <p>09032014 = 1394319600 = 9.Mart 2014</p>