title: Init Date variable with null value
body: <p>Simple question: how can init a Date value with a null value in VBA?</p>
  
  <pre><code>Dim DateStart As Date
  DateStart = Null
  </code></pre>
  
  <p>doesn't work.</p>
  
  <p>EDIT:</p>
  
  <p>I was just wondering if it's possible. In the beginning of my code I want to set the value to blank, halfway it will be given a value in most cases, if not, later on I'll request the value and if still blank I have to take another action to get a value</p>