title: difference between two SYSTEMTIME variable
body: <p>I want to get difference  between two SYSTEMTIME  variable. I saw someone asked this question here before, but he was told to convert both SYSTEMTIME structures to FILETIME..
  Is there another way to get the difference?</p>
  
  <pre><code>SYSTEMTIME st;
  GetSystemTime(&amp;st);
  </code></pre>
  
  <p>---some code here---</p>
  
  <pre><code>  SYSTEMTIME st2;
    GetSystemTime(&amp;st2);
  </code></pre>
  
  <p><strong>st-st2?</strong></p>