When a person signs a written promise to appear at the time and place specified in the written promise to appear and has not posted bail as provided in section 853.1 of the state Penal Code, the magistrate shall issue and have delivered for execution a warrant for his arrest within twenty days after his failure to appear as promised, or if such person promises to appear before an officer authorized to accept bail other than a magistrate and fails to do so on or before the date which he promised to appear, then within twenty days after the delivery of such written promise to appear by the officer to a magistrate having jurisdiction over the offense. (Ord. No. 944 (NCS), § 3.)