PGI & Billing in same date only

Hi, Experts,

The way our system works right now is the date on the invoice document is always the date of PGI.

The business requires that the invoice date be the date it is billed.

if PGI & invoice on the same date, then there is no issue.

but PGI & invoice in two different dates, invoice create date should be taken as billing date.

Thanks,

Madhushanka