diff --git a/src/pretix/presale/views/event.py b/src/pretix/presale/views/event.py
index 43dec358a..0c9e2bbe8 100644
--- a/src/pretix/presale/views/event.py
+++ b/src/pretix/presale/views/event.py
@@ -689,7 +689,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
             self._set_month_year()
             tz = self.request.event.timezone
             _, ndays = calendar.monthrange(self.year, self.month)
-            before = datetime(self.year, self.month, 1, 0, 0, 0, tzinfo=tz) - timedelta(days=1)
+            before = datetime(self.year, self.month, 1, 23, 59, 59, tzinfo=tz) - timedelta(days=1)
             after = datetime(self.year, self.month, ndays, 0, 0, 0, tzinfo=tz) + timedelta(days=1)
 
             if self.request.event.settings.event_calendar_future_only:
@@ -750,7 +750,7 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
             tz = self.request.event.timezone
             week = isoweek.Week(self.year, self.week)
             before = datetime(
-                week.monday().year, week.monday().month, week.monday().day, 0, 0, 0, tzinfo=tz
+                week.monday().year, week.monday().month, week.monday().day, 23, 59, 59, tzinfo=tz
             ) - timedelta(days=1)
             after = datetime(
                 week.sunday().year, week.sunday().month, week.sunday().day, 0, 0, 0, tzinfo=tz
diff --git a/src/pretix/presale/views/organizer.py b/src/pretix/presale/views/organizer.py
index d46c2ef6c..ecc123a05 100644
--- a/src/pretix/presale/views/organizer.py
+++ b/src/pretix/presale/views/organizer.py
@@ -768,7 +768,7 @@ class CalendarView(OrganizerViewMixin, EventListMixin, TemplateView):
             raise Http404()
 
         tz = get_current_timezone()
-        before = datetime(self.year, self.month, 1, 0, 0, 0, tzinfo=tz) - timedelta(days=1)
+        before = datetime(self.year, self.month, 1, 23, 59, 59, tzinfo=tz) - timedelta(days=1)
         after = datetime(self.year, self.month, ndays, 0, 0, 0, tzinfo=tz) + timedelta(days=1)
 
         ctx['date'] = date(self.year, self.month, 1)
@@ -854,7 +854,7 @@ class WeekCalendarView(OrganizerViewMixin, EventListMixin, TemplateView):
         tz = get_current_timezone()
         week = isoweek.Week(self.year, self.week)
         before = datetime(
-            week.monday().year, week.monday().month, week.monday().day, 0, 0, 0, tzinfo=tz,
+            week.monday().year, week.monday().month, week.monday().day, 23, 59, 59, tzinfo=tz,
         ) - timedelta(days=1)
         after = datetime(
             week.sunday().year, week.sunday().month, week.sunday().day, 0, 0, 0, tzinfo=tz,
@@ -1001,7 +1001,7 @@ class DayCalendarView(OrganizerViewMixin, EventListMixin, TemplateView):
 
         tz = get_current_timezone()
         before = datetime(
-            self.date.year, self.date.month, self.date.day, 0, 0, 0, tzinfo=tz,
+            self.date.year, self.date.month, self.date.day, 23, 59, 59, tzinfo=tz,
         ) - timedelta(days=1)
         after = datetime(
             self.date.year, self.date.month, self.date.day, 0, 0, 0, tzinfo=tz,