title: Add date and time to a file name in c
body: <p>Im looking for a way to add the current date and time to a log file im opening
  for now im using :</p>
  
  <pre><code>fopen("/var/log/SA_TEST","w");
  </code></pre>
  
  <p>How to make it</p>
  
  <pre><code>fopen("/var/log/SA_TEST_DATE_AND_TIME","w");
  </code></pre>
  
  <p>Thx a lot
  (In c)</p>