Explain what is meant by "temporally".

index.html

@@ -1669,6 +1669,14 @@ <h3>Validity Period</h3>
 when a <a>credential</a> ceases to be valid.
         </p>
 
+        <p>
+When comparing dates and times, the calculation is done "temporally", which
+means that the string value is converted to a "temporal value" which exists
+as a point on a timeline. Temporal comparisons are then performed by checking
+to see where the date and time being compared is in relation to
+a particular point on the timeline.
+        </p>
+
         <dl>
           <dt><var id="defn-validFrom">validFrom</var></dt>
           <dd>
@@ -1679,7 +1687,7 @@ <h3>Validity Period</h3>
 Note that this value represents the earliest point in time
 at which the information associated with the <code>credentialSubject</code>
 <a>property</a> becomes valid. If a `validUntil` value also exists, the
-`validFrom` value MUST express a datetime that is temporally the same or 
+`validFrom` value MUST express a datetime that is temporally the same or
 earlier than the datetime expressed by the `validUntil` value.
           </dd>
           <dt><var id="defn-validUntil">validUntil</var></dt>