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    <p>An unspecified time zone is exactly that - <em>unspecified</em>. No more, no less. It's not saying it's in UTC, nor is it saying it's in the local time zone or any other time zone, it's just saying that the time read from some clock somewhere was that time.</p> <p>The fact that it originated from an <code>xs:dateTime</code> doesn't really play into it at all. It's just an ISO 8601 date + time (without time zone) value.</p> <p>It really depends on what you <em>do</em> with this value as to what it actually means.</p> <p>In the real world, you probably should avoid values like this when working with <em>timestamps</em> - that is, the exact moment something occurs. For those you should specify an offset like <code>-07:00</code>, or a <code>Z</code> to indicate UTC.</p> <p>Where an unspecified value might have legitimate usage:</p> <ul> <li><p>When scheduling <em>future</em> events by recurrence pattern, and paired with a time zone (such as <code>America/New_York</code>). For details, see other answers of mine <a href="https://stackoverflow.com/a/19170823/634824">here</a>, <a href="https://stackoverflow.com/a/19627330/634824">here</a>, and <a href="https://serverfault.com/a/554761/100701">here</a>.</p></li> <li><p>When referring to a "floating" time, that might be at a different instantaneous moment in multiple time zones. Example: A network television show that starts at 7:00 PM. The Eastern US would see it before the Western US, but it still airs at the same "floating" time in each zone.</p></li> <li><p>When the time zone is already known by some other mechanism, and there is no risk of daylight saving time ambiguity, or when the risk is accepted and determined inconsequential.</p></li> </ul>
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    1. POWhat is the default time zone for an XML Schema dateTime if not specified?
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    1. USMatt Johnson
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    1. POWhat is the default time zone for an XML Schema dateTime if not specified?
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    1. CORight, I understand what "unspecified" means, but I was first trying to confirm whether the assertion that "default is UTC if not specified" was true. I can look more into 8601, but the XML Schema spec stops short of saying it uses 8601 strictly. For example, "The date and time datatypes described in this recommendation were _inspired by_ [ISO 8601]."
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    2. COIt's interesting that the [Wikipedia article](http://en.wikipedia.org/wiki/ISO_8601) about 8601 says "If no UTC relation information is given with a time representation, the time is assumed to be in local time."
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    3. COThe wording in that particular sentence in the Wikipedia article is slightly misleading. The sentence right above it is better: "... are represented as local time (with the location unspecified) ...". Another way to think about it is "**A** local time" vs "**THE** local time". In other words, "local" doesn't necessarily mean *your* local, it could be someone else's local.
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      1. USMatt Johnson
 

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