Cal. Educ. Code § 81641

For the purpose of securing bids or proposals the community college board shall publish at least once a week for two weeks in some newspaper of general circulation published in the district, or if there is no such paper, then in some newspaper of general circulation, circulated in the county a notice calling for bids or proposals, stating the work to be done or materials or supplies to be furnished and the time when and the place where bids or proposals will be opened. Whether or not bids or proposals are opened exactly at the time fixed in the public notice for opening bids or proposals, a bid or proposal shall not be received after that time.