add duration to heartbeat, add timezone array

src/components/Datetime.vue

@@ -5,6 +5,10 @@
 <script>
 import dayjs from "dayjs";
 import relativeTime  from "dayjs/plugin/relativeTime"
+import utc  from 'dayjs/plugin/utc'
+import timezone  from 'dayjs/plugin/timezone' // dependent on utc plugin
+dayjs.extend(utc)
+dayjs.extend(timezone)
 dayjs.extend(relativeTime)
 
 export default {
@@ -14,6 +18,9 @@ export default {
 
     computed: {
         displayText() {
+
+            console.log(dayjs.tz.guess())
+
             return this.value
         },
     }