add support for durations and timestamps

index.html

@@ -199,6 +199,18 @@ name + " is " + string(age) + " years old and " + (active ? "active" : "inactive
           true}}}</code
         >
       </div>
+
+      <div class="example" onclick="loadExample(this)">
+        <h4>Time and Date Operations</h4>
+        <code
+          data-expression="some_date < now - old ? 'old' : 'recent'"
+          data-context='{"some_date": "2023-10-01T12:00:00Z", "now": "2023-10-03T12:00:00Z", "old": "24h"}'
+          >Expression: some_date < now - old ? 'old' : 'recent'</code
+        >
+        <code
+          >Context: {"some_date": "2023-10-01T12:00:00Z", "now":
+          "2023-10-03T12:00:00Z", "old": "24h"}</code
+        >
     </div>
 
     <script type="module">