In computing any period of time 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 nonjudicial day, in which event the period runs until the end of the next day which is not a Saturday, a Sunday, or a nonjudicial day. When a period of time prescribed or allowed is less than 7 days, intermediate Saturdays, Sundays and nonjudicial days shall be excluded in the computation.