Validation between two dates in Adobe Sign

Dear all,

I need a quick help in resolving the following issue.

I kept two text boxes to fill "Start Date" and "End Date" in a template. I want to keep a validation that "Start date should be lesser than the End date"  Ex: Start date: Jan 2021 End date: Aug 2021 (after Jan 2021). If someone fills before Jan 2021, it should ask them to enter it correctly.

(Assume a case of someone fill their qualification/ work experience).

Have tried so many options (If) conditions but it doesn't work. It shows a message but doesn't validate and we could save the form with the wrong entry along with the wrong message!

Kindly help me out please! Thank you!