diff --git a/popup/index.js b/popup/index.js
index 66fae7d..437317e 100644
--- a/popup/index.js
+++ b/popup/index.js
@@ -20,14 +20,20 @@ browser.runtime.getBackgroundPage().then((page) => {
 });
 
 const updateNextEvent = (nextEvent) => {
+  const beginDate = new Date(nextEvent.begin);
+
   const calendarElement = document.getElementById('calendar');
   const strongElement = document.createElement('strong');
+  const timeElement = document.createElement('time');
   strongElement.textContent = nextEvent.name;
-  const dateNode = document.createTextNode(' ' + new Date(nextEvent.begin).toLocaleString());
+  timeElement.datetime = beginDate.toISOString();
+  const dateNode = document.createTextNode(beginDate.toLocaleString());
   // calendarElement.innerText = '';
   calendarElement.innerHTML = '<img src="../icons/font-awesome/clock-regular.svg" width="19" height="19" alt="Clock" />';
   calendarElement.append(strongElement);
-  calendarElement.append(dateNode);
+  calendarElement.append(document.createTextNode(' '));
+  calendarElement.append(timeElement);
+  timeElement.append(dateNode);
   if (nextEvent.location) {
     const locationNode = document.createTextNode(' (' + nextEvent.location + ')');
     calendarElement.append(locationNode);