Hello @vanapalli.kumar01 
,
Welcome to Kore Community 
Please check if the following posts are helpful:
https://test-discourse.kore.ai/t/can-anyone-help-me-to-validate-date-using-entity-type/2556
https://test-discourse.kore.ai/t/how-to-validate-dates-for-dateperiod-entity-type/2112/4
Thank you for stopping by!!