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In the below sample link when try to drag and drop an element sooner or later on the same day. The following error occure
" ERROR TypeError: Cannot read property 'getFullYear' of undefined" on stackblitz and
"Cannot read property 'setHours' of undefined" directly on the page of your Sample browser.

https://ej2.syncfusion.com/demos/#/material/schedule/group-by-date.html ("Cannot read property 'setHours' of undefined").
https://stackblitz.com/edit/angular-j4uk62?file=main.ts (''Cannot read property 'setHours' of undefined")