diff --git a/data/dbus-interfaces/org.gnome.Shell.CalendarServer.xml b/data/dbus-interfaces/org.gnome.Shell.CalendarServer.xml
index 51b71ef03..581471016 100644
--- a/data/dbus-interfaces/org.gnome.Shell.CalendarServer.xml
+++ b/data/dbus-interfaces/org.gnome.Shell.CalendarServer.xml
@@ -6,7 +6,7 @@
       <arg type="b" name="force_reload" direction="in"/>
     </method>
     <signal name="EventsAddedOrUpdated">
-      <arg type="a(ssbxxa{sv})" name="events" direction="out"/>
+      <arg type="a(ssxxa{sv})" name="events" direction="out"/>
     </signal>
     <signal name="EventsRemoved">
       <arg type="as" name="ids" direction="out"/>
diff --git a/js/ui/calendar.js b/js/ui/calendar.js
index a42d70ffb..852f1d0fe 100644
--- a/js/ui/calendar.js
+++ b/js/ui/calendar.js
@@ -78,12 +78,11 @@ function _getCalendarDayAbbreviation(dayNumber) {
 // Abstraction for an appointment/event in a calendar
 
 var CalendarEvent = class CalendarEvent {
-    constructor(id, date, end, summary, allDay) {
+    constructor(id, date, end, summary) {
         this.id = id;
         this.date = date;
         this.end = end;
         this.summary = summary;
-        this.allDay = allDay;
     }
 };
 
@@ -288,10 +287,10 @@ class DBusEventSource extends EventSourceBase {
         let changed = false;
 
         for (let n = 0; n < appointments.length; n++) {
-            const [id, summary, allDay, startTime, endTime] = appointments[n];
+            const [id, summary, startTime, endTime] = appointments[n];
             const date = new Date(startTime * 1000);
             const end = new Date(endTime * 1000);
-            let event = new CalendarEvent(id, date, end, summary, allDay);
+            let event = new CalendarEvent(id, date, end, summary);
             this._events.set(event.id, event);
 
             changed = true;
diff --git a/src/calendar-server/gnome-shell-calendar-server.c b/src/calendar-server/gnome-shell-calendar-server.c
index 4c5a64542..c8e2eafaf 100644
--- a/src/calendar-server/gnome-shell-calendar-server.c
+++ b/src/calendar-server/gnome-shell-calendar-server.c
@@ -52,7 +52,7 @@ static const gchar introspection_xml[] =
   "      <arg type='b' name='force_reload' direction='in'/>"
   "    </method>"
   "    <signal name='EventsAddedOrUpdated'>"
-  "      <arg type='a(ssbxxa{sv})' name='events' direction='out'/>"
+  "      <arg type='a(ssxxa{sv})' name='events' direction='out'/>"
   "    </signal>"
   "    <signal name='EventsRemoved'>"
   "      <arg type='as' name='ids' direction='out'/>"
@@ -110,7 +110,6 @@ typedef struct
   gchar  *summary;
   time_t  start_time;
   time_t  end_time;
-  guint   is_all_day : 1;
 } CalendarAppointment;
 
 static time_t
@@ -175,51 +174,6 @@ get_ical_end_time (ECalClient    *cal,
                                  default_zone);
 }
 
-static gboolean
-get_ical_is_all_day (ECalClient    *cal,
-                     ICalComponent *icomp,
-                     time_t         start_time,
-                     ICalTimezone  *default_zone)
-{
-  ICalProperty *prop;
-  ICalDuration *duration;
-  ICalTime     *dtstart;
-  struct tm    *start_tm;
-  time_t        end_time;
-  gboolean      retval;
-
-  dtstart = i_cal_component_get_dtstart (icomp);
-  if (dtstart && i_cal_time_is_date (dtstart))
-    {
-      g_clear_object (&dtstart);
-      return TRUE;
-    }
-
-  g_clear_object (&dtstart);
-
-  start_tm = gmtime (&start_time);
-  if (start_tm->tm_sec  != 0 ||
-      start_tm->tm_min  != 0 ||
-      start_tm->tm_hour != 0)
-    return FALSE;
-
-  if ((end_time = get_ical_end_time (cal, icomp, default_zone)))
-    return (end_time - start_time) % 86400 == 0;
-
-  prop = i_cal_component_get_first_property (icomp, I_CAL_DURATION_PROPERTY);
-  if (!prop)
-    return FALSE;
-
-  duration = i_cal_property_get_duration (prop);
-
-  retval = duration && (i_cal_duration_as_int (duration) % 86400) == 0;
-
-  g_clear_object (&duration);
-  g_clear_object (&prop);
-
-  return retval;
-}
-
 static CalendarAppointment *
 calendar_appointment_new (ECalClient    *cal,
                           ECalComponent *comp)
@@ -241,10 +195,6 @@ calendar_appointment_new (ECalClient    *cal,
   appt->summary     = g_strdup (i_cal_component_get_summary (ical));
   appt->start_time  = get_ical_start_time (cal, ical, default_zone);
   appt->end_time    = get_ical_end_time (cal, ical, default_zone);
-  appt->is_all_day  = get_ical_is_all_day (cal,
-                                           ical,
-                                           appt->start_time,
-                                           default_zone);
 
   e_cal_component_id_free (id);
 
@@ -361,7 +311,7 @@ app_notify_events_added (App *app)
   /* The a{sv} is used as an escape hatch in case we want to provide more
    * information in the future without breaking ABI
    */
-  g_variant_builder_init (&builder, G_VARIANT_TYPE ("a(ssbxxa{sv})"));
+  g_variant_builder_init (&builder, G_VARIANT_TYPE ("a(ssxxa{sv})"));
   for (link = events; link; link = g_slist_next (link))
     {
       CalendarAppointment *appt = link->data;
@@ -375,10 +325,9 @@ app_notify_events_added (App *app)
         {
           g_variant_builder_init (&extras_builder, G_VARIANT_TYPE ("a{sv}"));
           g_variant_builder_add (&builder,
-                                 "(ssbxxa{sv})",
+                                 "(ssxxa{sv})",
                                  appt->id,
                                  appt->summary != NULL ? appt->summary : "",
-                                 (gboolean) appt->is_all_day,
                                  (gint64) start_time,
                                  (gint64) end_time,
                                  &extras_builder);
@@ -390,7 +339,7 @@ app_notify_events_added (App *app)
                                  "/org/gnome/Shell/CalendarServer",
                                  "org.gnome.Shell.CalendarServer",
                                  "EventsAddedOrUpdated",
-                                 g_variant_new ("(a(ssbxxa{sv}))", &builder),
+                                 g_variant_new ("(a(ssxxa{sv}))", &builder),
                                  NULL);
 
   g_variant_builder_clear (&builder);