Every officer collecting or receiving any moneys belonging to or for the use of the City shall settle for the same with the City Treasurer on or before the last day of each month or at more frequent intervals as may be directed by the Manager, and immediately pay the same to the City Treasurer, for the benefit of the funds to which said moneys severally belongs. When the last day of the month falls on Sunday or a legal holiday, the said payments shall be made on the next preceding business day.