The countdown is based on server time, which is currently:
The "Statement of Account" portion of a USAC invoice shows the previous balance due and summarizes all transactions that have occurred on a company's account since the last invoice was processed. This includes support mechanism charges, FCC Forms 499 A/Q annual true up adjustments (debits and credits), late filing fees, payments made, interest and penalties, as well as other miscellaneous charges that are detailed in the body of the invoice.
The statement of account also shows the company's total outstanding USAC balance which is the sum of the previous balance and current transactions.
The total outstanding USAC balance is as of the date indicated and may not be the total amount due as of the payment due date. If your USAC account has any delinquent debt that is or will be over 30 days delinquent when the payment is made, you will need to contact the billing department to obtain the payoff amount.
The bottom of page one of a company's USAC invoice designates the FCC Form 499-Q data used to determine support mechanism charges as well as the payment information to remit a payment to USAC.