The date of the festival changes each year as it is determined by the Chinese lunar calendar, and thus normally falls in late January or early February.
Even though the official public holiday period only lasts a week, the preparation, holiday atmosphere and the extended celebrations can last for almost a month, starting two weeks before CNY.
This naturally can have implications for doing business in China during Chinese New Year.
Almost every local business and company will close during this period. Corporations, factories, logistics, banks, assemblers are shut down completely. This is especially apparent in tier 1 cities - Beijing, Shanghai, Shenzhen, Guangzhou. Businesses commonly close early to allow staff to travel across China to be with their families for the Chinese New Year period.