Hi Deepak,
Greetings from Syncfusion support.
At present, we are not providing the masking support for the DatePicker. We have already considered to provide this feature in any of our upcoming releases. We appreciate your patience until then.
You can also track the details regarding this feature with our Feature Management System from the below link.
We are closing this incident now. You can communicate with us regarding the open features at any time using the “Contact” option.
Regards,
Berly B.C