0.12.22 timezone in chat messages

templates/tb_base.html

@@ -134,6 +134,14 @@
 
         {% include 'blocks/b_footer.html' %}
 
+    <script>
+        let tz = Intl.DateTimeFormat().resolvedOptions().timeZone;
+        if (!tz) {
+            tz = "UTC"
+        }
+        document.cookie = "user_tz=" + tz + ";path=/";
+    </script>
+</body>
 
 </body>