Show Alert message on apply button in BIP Reports

ALOK SH-Oracle

We have 2 Parameter in BI Publisher Reports Name - From Date and To date ,where user can select both the date value .

The requirement is if user select from date and to date and if try to view the reports and if the difference between from date and To date is more than 31 days then Reports should not run that means when user click on Run report then show some alert message.

Any solution on this requirement,