title: Optional Parameter with now (Date) default value
body: <p>How to assign the default Date Time ( Now ) value for optional parameter.</p>
  
  <p>When assigning the now object to optional parameter below error is raised </p>
  
  <pre><code>Constant expression is required
  </code></pre>
  
  <p>Code:</p>
  
  <pre><code>Public Sub ReminderMail(Optional ByVal ReminderMailDate As DateTime = Now)
  
  // Code Block
  
  End Sub 
  </code></pre>