title: Excel NETWORKDAYS - Do these returned values look more reasonable?
body: <p>Do these returned values look more reasonable for NETWORKDAYS?</p>
  
  <p>2013/6/26 Wed<br>
  2013/6/27 Thu<br>
  2013/6/28 Fri<br></p>
  
  <pre><code>=NETWORKDAYS("2013/6/27","2013/6/26") = -2   
  </code></pre>
  
  <p>Should above better return -1?<br><br></p>
  
  <pre><code>=NETWORKDAYS("2013/6/27","2013/6/27") = 1   
  </code></pre>
  
  <p>Should above better return 0?<br><br></p>
  
  <pre><code>=NETWORKDAYS("2013/6/27","2013/6/28") = 2   
  </code></pre>
  
  <p>Should above better return 1?<br><br></p>