(a) All taxes, state, county, and municipal, to be collected under this part, parts 10, 15 and 16 of this chapter, and chapter 5, parts 18-20 of this title shall be payable the first Monday in October in each year, except taxes of municipal corporations that, under existing laws, are authorized to collect their own taxes on property and privileges; provided, that, whenever, under any plan or program of consolidation of governmental functions of county offices with comparable facilities provided under any municipal charter, it is expedient to fix different due dates than those established in this subsection (a), in order to avoid the destruction of existing municipal fiscal policies, the county trustee of any county, by and with the consent of a majority of the members of the county legislative body of the county, may establish due dates other than those set forth in this subsection (a).

(b) County revenue shall be collected by the officers at the time and in the manner prescribed for the collection of the state revenue.

(c) All municipal taxes collectible by the county trustee shall become due and delinquent at the same time as state and county taxes; provided, that, whenever, under any plan or program of consolidation of governmental functions of county offices with comparable facilities provided under any municipal charter, it is expedient to fix different due dates than those established in subsection (a), in order to avoid the destruction of existing municipal fiscal policies, the county trustee of any county, by and with the consent of a majority of the members of the county legislative body of the county trustee's county, may establish due dates other than those set forth in subsection (a).