Billing date in future date

Dear plz help urgent issue

I want to create billing with future date but i dont want to make 11 Routine in VTFL--VBRK/VBRP

so plz tell me ? while creating invoice if user keeps new date system would allow . so what i do

ex : created delivery 15th so in vf01 we wants to keep like 17th, or 18, or 20th what ever he wants

any possibility is there in vf04 plz tell me