title: Getting original time zone of DateTime value when parsing
body: <p>I have a set of <code>DateTime</code> text representations in ISO 8601 format, some of them have time zone specified. By default, <code>DateTime.Parse()</code> adjusts them to the local time zone (or to UTC with a special option), but in both cases the original time zone is missing. However, I need to detect which of <code>DateTime</code> strings were specified with the time zone and get its value for further processing. </p>
  
  <p>Any ideas on how to do that?</p>
  
  <p>UPD sample inputs:</p>
  
  <p>2015-06-26T22:57:09Z<br>
  2015-06-26T22:57:09<br>
  2015-06-26T22:57:09+01:00  </p>