fix(scheduler-core): consider seconds instead of milliseconds while c…

…alculate intervals (#2064)

packages/dx-react-scheduler/README.md

@@ -1,7 +1,11 @@
 # DevExtreme React Scheduler
 
+Project status: **CTP**
+
 DevExtreme React Scheduler is a component that displays appointments from a local or remote source.
 
+[Website](https://devexpress.github.io/devextreme-reactive/react/scheduler/) | [Demos](https://devexpress.github.io/devextreme-reactive/react/scheduler/demos/) | [Docs](https://devexpress.github.io/devextreme-reactive/react/scheduler/docs/)
+
 ## License
 
 [DevExtreme licensing](https://js.devexpress.com/licensing/).

packages/dx-scheduler-core/src/plugins/vertical-rect/helpers.test.ts

@@ -30,6 +30,16 @@ describe('Vertical rect helpers', () => {
         .toBe(new Date(2018, 5, 25, 8, 30).toString());
     });
 
+    it('should consider seconds instead of milliseconds', () => {
+      const viewCellsData = [
+        [{
+          startDate: new Date('2018-06-26 08:00:04:100'), endDate: new Date('2018-06-26 08:30:04'),
+        }],
+      ];
+      expect(getCellByDate(viewCellsData, new Date(2018, 5, 26, 8, 0, 4, 50)).index)
+        .toBe(0);
+    });
+
     it('should calculate cell index by takePref property', () => {
       const viewCellsData = [
         [

packages/dx-scheduler-core/src/plugins/vertical-rect/helpers.ts

@@ -16,7 +16,7 @@ export const getCellByDate: GetCellByDateFn = (viewCellsData, date, takePrev = f
     .isBetween(
       timeCell[cellIndex].startDate,
       timeCell[cellIndex].endDate,
-      undefined,
+      'seconds',
       takePrev ? '(]' : '[)'),
     );