title: un-representable DateTime
body: <p>I have method which expects two datetime parameters</p>
  
  <pre><code>public  void SomeReport(DateTime TimeFrom, DateTime TimeTo)
  {
      // ommited 
      TimeFrom.ToString("ddMMyy"), TimeTo.ToString("ddMMyy")));
      // ommited
  }
  </code></pre>
  
  <p>When I'm sending this params</p>
  
  <pre><code> DateTime TimeTo = DateTime.Now;
   DateTime TimeFrom = new DateTime().AddHours(-1);
  </code></pre>
  
  <p>This error occured:</p>
  
  <blockquote>
    <p>System.ArgumentOutOfRangeException : The added or subtracted value results in an un-representable DateTime.</p>
  </blockquote>
  
  <p>What can be the problem?</p>