Nine o'clock. According to the inquiry of Lanzhou Rural Commercial Bank in official website, the official working hours are from 9: 00 am to 5: 00 pm on February 20, 2022. Lanzhou, known as Jincheng in ancient times, is a prefecture-level city and the capital of Gansu Province, and the State Council has been approved as an important industrial base and comprehensive transportation hub in northwest China.