8: 00 am to 9: 30 pm, 8: 30 am to 9: 30 pm on Saturday, and 5: 30 am on Sunday. According to the development time of the library of Nanjing University of Posts and Telecommunications, the library is open from 8 am to 9: 30 pm from Monday to Friday, from 8: 30 am to 9: 30 pm on Saturday, and from 30 am to 5 pm on Sunday. Nanjing University of Posts and Telecommunications (hereinafter referred to as "Nanyou") is located in Nanjing, Jiangsu Province. It is a comprehensive key university jointly funded by the central and local governments, and the competent department is the Education Department of Jiangsu Province.