title: Change the format of dateTime to date only
body: <p>I have an list: "IList" that one of the filed is "dateTime". 
  I added this list to dataGrid (wpf), and all the values of the filed "dateTime" show in this format: "MM/dd/YYYY hh:mm:ss tt", 
  I want this values will show only date (date format: dd/MM/YYYY).</p>
  
  <p>My code (This is not a solution):</p>
  
  <pre><code>        listUsers = (IList&lt;Users&gt;)list;
          foreach (Users user in listUsers)
          {
              user.birthday = user.birthday.Date;
          }
          dataGrid1.ItemsSource = listUsers;
          listClass = "Users";
  </code></pre>