title: ISO 8601 with Daylight Savings
body: <p>My API is representing time to clients using ISO 8601. We have a feature where we want to display which timezone it was from. By purely storing the timezone offset, we are loosing track of that detail.</p>
  
  <p>ie, Utah and Arizona observe MST <code>-06:00</code> for half of the year and Utah switches to MDT <code>-07:00</code> for the other half. Our current solution is to determine if the date was during daylight savings and to use <code>*DT</code> timezones during and <code>*ST</code> otherwise, but ISO 8601 dates from Arizona would result in Pacific Daylight Time.</p>
  
  <p>Is there a way to specify whether daylight savings is being observed in an ISO 8601 format? Like <code>2016-01-11T13:00:04Z DST0</code> or something similar?</p>