In computing any period of time prescribed or allowed by this chapter, 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 falls on a Saturday, Sunday or official holiday observed by the city, in which event the period runs until the end of the next day which is neither a Saturday, Sunday or official holiday observed by the city. [Ord. 2018-09-014 § 1].