The evidence from the provided sources consistently and strongly supports the statement. One source explicitly states that 'The Office of Management and Budget confirmed' the shutdown would happen at midnight. Several other credible sources corroborate this by detailing the OMB's official actions leading up to the deadline. These actions include issuing orders, preparing to send memos to federal agencies, and discussing contingency plans, all of which serve as a functional confirmation that the shutdown was proceeding as scheduled. The head of the OMB was also quoted discussing these plans. There is no conflicting information among the sources, and the collective evidence points to the OMB officially acknowledging and managing the start of the government shutdown at midnight.