Coupon with limited date to book

Hello,

I have problem to doesn’t allow client from using coupon to book after some date

For example: i have coupon will finish on 17 december.

the client have right to use it only to book for date before 17 december if he book for 20 december shouldn’t be applied the coupon.

Because the problem now i can get coupon to client and he can use it now to book on march or june …