Not really... It depends on when you created the account.
If you create an account before the 15th of the month, then you invoice date is always the 15th of every month. They usually get around to sending out invoices on the 18-19th and try to hit the card soon after.
If you create an account after the 15th your bill date is month end.
Glad this thread was made 'cause this has been on my mind. Is there a way to get around opening your account after the 15th and yet not be billed for the first time within days of opening it? Other than not listing anything of course