Licenses to marry shall be issued by the county clerk and recorder only during the hours that the office of the county clerk and recorder is open as prescribed by law and at no other time, and such licenses shall show the exact date and hour of their issue. A license shall not be valid for use outside the state of Colorado. Within the state, such licenses shall not be valid for more than thirty-five days after the date of issue. If any license to marry is not used within thirty-five days, it is void and shall be returned to the county clerk and recorder for cancellation.