Okla. Stat. tit. 36, § 36-121: Computation of time periods

In computing any period of time prescribed or allowed by this

title, by the rules of the Insurance Commissioner, or by any

applicable statute, the day of the act, event or default from which

the designated period of time begins to run shall not be included.

The last day of the period so computed shall be included, unless it

is a Saturday, a Sunday, a legal holiday as defined by the Oklahoma

Statutes or any day when the office of the Commissioner does not

remain open for public business until 4:00 p.m., in which event the

period runs until the end of the next day when the office of the

Commissioner is open until 4:00 p.m. When the period of time

prescribed or allowed is less than seven (7) days, intermediate

Saturdays, Sundays and legal holidays shall be excluded in the

computation.