app/Services/Calendar/CalendarViewBuilder.php

@@ -28,7 +28,7 @@ class CalendarViewBuilder
         $gridStartMinutes = $daytimeHours ? ((int) $daytimeHours['start'] * 60) : 0;
         $gridEndMinutes = $daytimeHours ? ((int) $daytimeHours['end'] * 60) : (24 * 60);
 
-        return $events->flatMap(function ($e) use (
+        $payloads = $events->flatMap(function ($e) use (
             $calendarMap,
             $uiFormat,
             $view,
@@ -151,7 +151,12 @@ class CalendarViewBuilder
                     'duration'        => $placement['duration'],
                 ];
             })->filter()->values();
-        })->keyBy('occurrence_id');
+        })->filter();
+
+        // ensure chronological ordering across calendars for all views
+        return $payloads
+            ->sortBy('start')
+            ->keyBy('occurrence_id');
     }
 
     /**