Okla. Stat. tit. 41, § 41-61: Computation of time

The time within which an act is to be done, as provided for in

Title 41 of the Oklahoma Statutes, shall be computed by excluding

the first day and including the last day. If the last day is a

legal holiday as defined by Section 82.1 of Title 25 of the Oklahoma

Statutes, it shall be excluded. The provisions of this section are

hereby declared to be a clarification of the law as it existed prior

to the effective date of this act and shall not be considered or

construed to be a change of the law as it existed prior to the

effective date of this act. Any action or proceeding arising under

Title 41 of the Oklahoma Statutes prior to the effective date of

this act for which a determination of the period of time prescribed

by this section is in question or has been in question due to the

enactment of Section 20, Chapter 293, O.S.L. 1999, shall be governed

by the method for computation of time as prescribed by this section.