diff --git a/pinaxcon/templates/symposion/schedule/_grid.html b/pinaxcon/templates/symposion/schedule/_grid.html
index c3d80deebd9b966aca73fe557b92cd6af7c56363..d3c109163592b6ee417bb6aa83534546d86c63e2 100644
--- a/pinaxcon/templates/symposion/schedule/_grid.html
+++ b/pinaxcon/templates/symposion/schedule/_grid.html
@@ -1,7 +1,7 @@
 {% load lca2018_tags %}
 {% load waffle_tags %}
 
-<table class="calendar table table-bordered">
+<table class="calendar table table-bordered" data-date="{{ timetable.day.date|date:'c' }}">
   <thead>
     <tr>
       <th scope="row" class="time"><em>Room</em></th>
@@ -26,9 +26,9 @@
   <tbody>
     {% for row in timetable %}
     <tr class="calendar-row">
-      <th scope="row" class="time"><p>{{ row.time|date:"h:iA" }}</p></th>
+      <th scope="row" class="time" data-time="{{ timetable.day.date|date:'c' }}T{{ row.time|date:'c' }}"><p>{{ row.time|date:"h:iA" }}</p></th>
       {% for slot in row.slots %}
-      <td class="slot slot-{{ slot.kind.label }}" colspan="{{ slot.colspan }}" rowspan="{{ slot.rowspan }}">
+      <td class="slot slot-{{ slot.kind.label }}" colspan="{{ slot.colspan }}" rowspan="{{ slot.rowspan }}" data-startdatetime="{{ slot.start_datetime }}" data-enddatetime="{{ slot.end_datetime }}">
         {% with slot.kind.label.lower as label %}
         {% if label == "talk" or label == "tutorial" %}
           {% if slot.content.unpublish and not request.user.is_staff %}