Okla. Admin. Code § 710:65-3-3
If a due date falls on Saturday, Sunday, a holiday, or dates when the Federal Reserve Banks are closed, such due date shall be considered to be the next business date. [See: 68 O.S. §1365]
Amended at 11 Ok Reg 3521, eff 6-26-94
Amended at 29 Ok Reg 542, eff 5-11-12