The 21 Day Window

As part of the Reg Z changes and the Credit Card Act changes, there is the requirement to have at least a 21 day window from the billing statement to when the payment is due. Does this affect our HELOCs and Ready Reserve (overdraft protection) accounts which are both open end credit? Our HELOCs have statements printed on the first of each month with payments due on the 15th, if paid manually or the 5th, if paid with auto-debit, and our Ready Reserve accounts have payments automatically taken at the time the statement cycles. I was initially told it does not affect them - but I just am not sure!