006-1 Wyo. Code R. § 1-6
(a) In computing any period of time prescribed or allowed by these rules, the day of the act, or event 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, or a legal holiday, or, when the act to be done is the filing of a paper, a day on which weather or other conditions have made the office of the Department inaccessible, in which event the period runs until the end of the next day which is not one of the aforementioned days.
(b) When the time period prescribed or allowed by these rules is less than eleven (11) days, intermediate Saturdays, Sundays, and legal holidays shall be excluded in the computation. Whenever a party has the right or is required to do some act or take some proceedings within a prescribed period after the service of a notice or other paper upon the party, and the notice or paper is served upon the party by mail, three days shall be added to the prescribed period.
006-1 Wyo. Code R. § 1-6