We are a subscription and we bill in advance for the month. We bill monthly, quartery, bi annually and annually. We need the date to appear on the invoice that the invoice covers.

For example: It is a monthly invoice, so every month the invoice automatically says: Covers From December 1st to December 31st 2017.

Or if its quarterly: Invoice Covers from December 1st 2017 to February 28th 2018 etc..

The dates are very important for our clients to know how long they have actually paid for.