31 C.F.R. § 309.6
When Treasury bills are to be offered, tenders therefor will be invited through public notice given by the Secretary of the Treasury. Such public notices may be issued by the Secretary of the Treasury in the name of "the Treasury Department" with the same force and effect as if issued in the name of the Secretary of the Treasury. In such notice there will be set forth the amount of Treasury bills for which tenders are then invited, the date of issue, the date or dates when such bills will become due and payable, the date and closing hour for the receipt of tenders at the Federal Reserve Banks and branches and at the Bureau of the Fiscal Service, Washington, DC 20226, and the date on which payment for accepted tenders must be made or completed.
31 C.F.R. §309.6