Generally, the pre-sale period for tickets purchased on the Internet is 30 days in advance, and the pre-sale period for tickets purchased at the ticket window of the railway station is 28 days in advance.
Under normal circumstances, train tickets can be purchased 15 days in advance, but January 28, 2018 is during the Spring Festival travel season - this special situation may be able to advance further, you can pay attention to the news about the Spring Festival travel season. <br/><br/> If you find the answer useful, please click "Accept", thank you!