title: DateTime ISO 8601 without timezone component
body: <p>I've been doing work with parsing datetime strings for our international application.  I'm running into an interpretation issue that I can't seem to find a definitive answer.  <strong>Should an ISO 8601 datetime string without a timezone component be treated as local time?</strong></p>
  
  <p>Per <a href="https://en.wikipedia.org/wiki/ISO_8601#Time_zone_designators" rel="noreferrer">wikipedia</a> (which I don't want to base my business decisions off of):</p>
  
  <blockquote>
    <p>If no UTC relation information is given with a time representation,
    the time is assumed to be in local time.</p>
  </blockquote>
  
  <p>However, I can't find supporting documentation via ISO or any other generally acceptable source of truth.  Everything that I've found talks about how to handle offsets for local time (e.g. +/- 0500, etc). Assuming local time in these cases would help me substantially as my users can submit the same date for all regions without needed to calculate the specific offset for each region.</p>
  
  <p>For example:</p>
  
  <pre><code>2012-01-01T00:00:00 # Convert to local
  2012-01-01T00:00:00Z # Zulu/UTC...don't convert
  </code></pre>
  
  <p>Is there an established interpretation for timezone-less ISO 8601 strings?</p>