The tax collector shall, within 30 days after the date of delinquency, begin the publication of a notice of sale of the land upon which the assessments have not been paid, which publication shall be made by two insertions in a daily or weekly newspaper published and circulated in the city. The dates fixed for the sale of such land shall be not less than five days nor more than 10 days after the last publication of said notice of sale, or after the completion of posting, as the case may be.