diff --git a/dav_events/templates/dav_events/event_create/ModeForm.html b/dav_events/templates/dav_events/event_create/ModeForm.html
index aa96c9a..dad771e 100644
--- a/dav_events/templates/dav_events/event_create/ModeForm.html
+++ b/dav_events/templates/dav_events/event_create/ModeForm.html
@@ -24,9 +24,33 @@
         }
     }
 
+    function add_first_day_handler() {
+        var e = $("#id_first_day_widget");
+        e.on('changeDate', function(){ first_day_handler(); });
+    }
+
+    function first_day_handler() {
+        var d = $("#id_first_day_widget").find("input").val();
+        var e = $("#id_last_day_widget");
+        e.datetimepicker('setStartDate', d);
+    }
+
+    function add_alt_first_day_handler() {
+        var e = $("#id_alt_first_day_widget");
+        e.on('changeDate', function(){ alt_first_day_handler(); });
+    }
+
+    function alt_first_day_handler() {
+        var d = $("#id_alt_first_day_widget").find("input").val();
+        var e = $("#id_alt_last_day_widget");
+        e.datetimepicker('setStartDate', d);
+    }
+
     $(document).ready(function(){
         add_sport_handler();
         sport_handler();
+        add_first_day_handler();
+        add_alt_first_day_handler();
     });
 </script>
 {% endblock head-additional %}