diff --git a/packages/devextreme/js/__internal/scheduler/appointments/resizing/get_delta_time.test.ts b/packages/devextreme/js/__internal/scheduler/appointments/resizing/get_delta_time.test.ts
index e07a51c9abf0..105231ccc356 100644
--- a/packages/devextreme/js/__internal/scheduler/appointments/resizing/get_delta_time.test.ts
+++ b/packages/devextreme/js/__internal/scheduler/appointments/resizing/get_delta_time.test.ts
@@ -70,7 +70,7 @@ describe('getDeltaTime', () => {
   });
 
   ['timelineDay', 'timelineWeek', 'timelineWorkWeek'].forEach((view) => {
-    it(`should return zero for not resized appointment in horizontal ${view} view`, () => {
+    it(`should return cell duration delta for resized appointment in horizontal ${view} view`, () => {
       expect(getDeltaTime(
         { width: 50, height: 100 },
         { width: 100, height: 100 },
diff --git a/packages/devextreme/js/__internal/scheduler/appointments/resizing/m_core.ts b/packages/devextreme/js/__internal/scheduler/appointments/resizing/m_core.ts
index a235bc0515b4..973229e1601c 100644
--- a/packages/devextreme/js/__internal/scheduler/appointments/resizing/m_core.ts
+++ b/packages/devextreme/js/__internal/scheduler/appointments/resizing/m_core.ts
@@ -31,7 +31,7 @@ const getCellData = (
   // NOTE: All day appointments occupy day if they start at the beginning of the day,
   // but long appointments are not. So for all day appointments endDate === startDate,
   // for long appointments endDate = startDate + 1 day.
-  if (!isAllDay) {
+  if (!isAllDay && isOccupiedAllDay) {
     cellData.endDate = dateUtilsTs.addOffsets(cellData.startDate, toMs('day'));
   }
 
diff --git a/packages/devextreme/js/__internal/scheduler/m_subscribes.ts b/packages/devextreme/js/__internal/scheduler/m_subscribes.ts
index 93f5f76ba0ea..408a9b717549 100644
--- a/packages/devextreme/js/__internal/scheduler/m_subscribes.ts
+++ b/packages/devextreme/js/__internal/scheduler/m_subscribes.ts
@@ -25,11 +25,14 @@ const isAllDay = (
 ): boolean => {
   const adapter = new AppointmentAdapter(appointmentData, scheduler._dataAccessors);
 
-  if (VERTICAL_VIEW_TYPES.includes(scheduler.currentView.type)) {
-    return isAppointmentTakesAllDay(adapter, scheduler.option('allDayPanelMode'));
+  if (!VERTICAL_VIEW_TYPES.includes(scheduler.currentView.type)) {
+    return adapter.allDay;
   }
 
-  return adapter.allDay;
+  return isAppointmentTakesAllDay(
+    adapter,
+    scheduler.getViewOption('allDayPanelMode'),
+  );
 };
 
 const subscribes = {
diff --git a/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/generate_grid_view_model.ts b/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/generate_grid_view_model.ts
index b3d23b419944..eebe41bb1b93 100644
--- a/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/generate_grid_view_model.ts
+++ b/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/generate_grid_view_model.ts
@@ -22,6 +22,7 @@ export const sortAppointments = (
 ): SortedEntity[] => {
   const {
     isMonthView,
+    isTimelineView,
     hasAllDayPanel,
     snapToCellsMode,
     viewOffset,
@@ -35,7 +36,7 @@ export const sortAppointments = (
       sortByStartDate(group);
       const innerStep0 = isMonthView || panelName === 'allDayPanel'
         ? expandAllDayAllDayPanel(group, endDayHour, viewOffset)
-        : expandAllDayRegularPanel(group);
+        : expandAllDayRegularPanel(group, isTimelineView);
       const innerStep1 = splitByParts(innerStep0, optionManager.getSplitIntervals(panelName));
       sortByDuration(innerStep1);
       sortByStartDate(innerStep1);
diff --git a/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/steps/expand_all_day.test.ts b/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/steps/expand_all_day.test.ts
index 789c5eec5e6a..9efa53d55964 100644
--- a/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/steps/expand_all_day.test.ts
+++ b/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/steps/expand_all_day.test.ts
@@ -98,13 +98,19 @@ describe('expandAllDay', () => {
       ]);
     });
 
-    it('should set +1 day from end date to all day appointment', () => {
+    it('should keep dates of all day appointment with duration', () => {
       expect(expandAllDayRegularPanel([
         {
           allDay: true,
-          startDateUTC: Date.UTC(2020, 0, 10),
-          endDateUTC: Date.UTC(2020, 0, 10),
+          startDateUTC: Date.UTC(2020, 0, 10, 4),
+          endDateUTC: Date.UTC(2020, 0, 11, 5),
         }, {
+          allDay: true,
+          startDateUTC: Date.UTC(2020, 0, 11, 23),
+          endDateUTC: Date.UTC(2020, 0, 12),
+        },
+      ])).toEqual([
+        {
           allDay: true,
           startDateUTC: Date.UTC(2020, 0, 10, 4),
           endDateUTC: Date.UTC(2020, 0, 11, 5),
@@ -113,12 +119,22 @@ describe('expandAllDay', () => {
           startDateUTC: Date.UTC(2020, 0, 11, 23),
           endDateUTC: Date.UTC(2020, 0, 12),
         },
-      ])).toEqual([
+      ]);
+    });
+
+    it('should expand all day appointment with duration on timeline view', () => {
+      expect(expandAllDayRegularPanel([
         {
           allDay: true,
-          startDateUTC: Date.UTC(2020, 0, 10),
-          endDateUTC: Date.UTC(2020, 0, 11),
+          startDateUTC: Date.UTC(2020, 0, 10, 4),
+          endDateUTC: Date.UTC(2020, 0, 11, 5),
         }, {
+          allDay: true,
+          startDateUTC: Date.UTC(2020, 0, 11, 23),
+          endDateUTC: Date.UTC(2020, 0, 12),
+        },
+      ], true)).toEqual([
+        {
           allDay: true,
           startDateUTC: Date.UTC(2020, 0, 10, 4),
           endDateUTC: Date.UTC(2020, 0, 12, 4),
@@ -129,5 +145,21 @@ describe('expandAllDay', () => {
         },
       ]);
     });
+
+    it('should set +1 day from end date to zero-duration all day appointment', () => {
+      expect(expandAllDayRegularPanel([
+        {
+          allDay: true,
+          startDateUTC: Date.UTC(2020, 0, 10),
+          endDateUTC: Date.UTC(2020, 0, 10),
+        },
+      ])).toEqual([
+        {
+          allDay: true,
+          startDateUTC: Date.UTC(2020, 0, 10),
+          endDateUTC: Date.UTC(2020, 0, 11),
+        },
+      ]);
+    });
   });
 });
diff --git a/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/steps/expand_all_day.ts b/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/steps/expand_all_day.ts
index 99c414167557..e8b1b39bfda9 100644
--- a/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/steps/expand_all_day.ts
+++ b/packages/devextreme/js/__internal/scheduler/view_model/generate_view_model/steps/expand_all_day.ts
@@ -74,11 +74,16 @@ export const expandAllDayAllDayPanel = <T extends Pick<ListEntity, 'startDateUTC
 
 export const expandAllDayRegularPanel = <T extends Pick<ListEntity, 'startDateUTC' | 'endDateUTC' | 'allDay'>>(
   entities: T[],
+  isTimelineView = false,
 ): T[] => entities.map((entity) => {
   if (!entity.allDay) {
     return entity;
   }
 
+  if (!isTimelineView && entity.endDateUTC > entity.startDateUTC) {
+    return entity;
+  }
+
   const startDate = new Date(entity.startDateUTC);
   const endDate = new Date(entity.endDateUTC);
   endDate.setDate(endDate.getDate() + 1);