(a) An action is commenced by the filing of a petition in the clerk's office when that office is open, or by a magistrate's acceptance of a petition for filing pursuant to subsection (b) of this section when the clerk's office is closed.
(b) When the office of the clerk is closed and the juvenile court counselor requests a petition alleging a juvenile to be delinquent or undisciplined, a magistrate may draw and verify the petition and accept it for filing, which acceptance shall constitute filing. The magistrate's authority under this subsection is limited to emergency situations when a petition is required in order to obtain a secure or nonsecure custody order. Any petition accepted for filing under this subsection shall be delivered to the clerk's office for processing as soon as that office is open for business.