Hi Ritesh,
Thanks for contacting Syncfusion support.
From your query, we suspect that you would like, the Datepicker to be rendered with a default value set from Model and trigger the change event in client side when the DatePicker value changes.
We have created a sample based on the requirement and we were not able reproduce the reported issue (empty value received in change event).
For your convenience, we have updated a sample in the given link.
Also, the change event will be triggered only when the value of the Datepicker changes (in User Interaction or when value is changed in code behind).
The default value of DatePicker is null. So if no value will be set by default in Datepicker.
For more details, please follow the below link.
If this is not the scenario, revert with a modified sample to reproduce the issue, so that we could provide you the prompt response.
Regards,
Deepa L.