An "ask at order" response using the datetime datetype for the result value (id = "date-lastmp")

<?xml version="1.0" encoding="UTF-8"?>

<Observation xmlns="http://hl7.org/fhir">
  <id value="date-lastmp"/> 
  <text> <status value="generated"/> <div xmlns="http://www.w3.org/1999/xhtml"><p> <b> Generated Narrative: Observation</b> <a name="date-lastmp"> </a> <a name="hcdate-lastmp"> </a> </p> <div style="display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border:
       1px solid #8da1b4; border-radius: 5px; line-height: 60%"><p style="margin-bottom: 0px">Resource Observation &quot;date-lastmp&quot; </p> </div> <p> <b> status</b> : final</p> <p> <b> category</b> : AOE <span style="background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki"> (<a href="http://terminology.hl7.org/5.5.0/CodeSystem-observation-category.html">Observation Category Codes</a> #survey &quot;Survey&quot;)</span> </p> <p> <b> code</b> : Last menstrual period start date <span style="background: LightGoldenRodYellow; margin: 4px; border: 1px solid khaki"> (<a href="https://loinc.org/">LOINC</a> #8665-2)</span> </p> <p> <b> subject</b> : <a href="patient-example-b.html">Patient/pat2</a>  &quot;Duck DONALD&quot;</p> <p> <b> effective</b> : 2016-01-24</p> <p> <b> value</b> : 2016-12-30</p> </div> </text> <status value="final"/> 
  <category> 
    <coding> 
      <system value="http://terminology.hl7.org/CodeSystem/observation-category"/> 
      <code value="survey"/> 
      <display value="Survey"/> 
    </coding> 
    <text value="AOE"/> 
  </category> 
  <code> 
    <coding> 
      <system value="http://loinc.org"/> 
      <code value="8665-2"/> 
      <display value="Last menstrual period start date"/> 
    </coding> 
    <text value="Last menstrual period start date"/> 
  </code> 
  <subject> 
    <reference value="Patient/pat2"/> 
  </subject> 
  <effectiveDateTime value="2016-01-24"/> 
  <valueDateTime value="2016-12-30"/> 
</Observation>