Change billing cycle in Protected Content

Suppose a client registers for a monthly subscription plan on the 12th day of the month but they prefer to be billed every month on the 3rd day of each month.

If they register on the 12th day, can the site admin edit the expiration date to charge on the 3rd day of each month rather than the 12th?

The alternative is to make the client wait until the 3rd of the following month to sign-up which will cause a gap in billing for the current month.