Monday to Sunday from 11:11 to 22:11. According to the official website of Chengdu Yintai City, the business hours of Chengdu Yintai in99 are from 11:11 to 22:11 from Monday to Sunday. Chengdu, also known as Rongcheng and Jincheng for short, is located in the central part of Sichuan Province. It is the capital and sub-provincial city of Sichuan Province, one of the first national historical and cultural cities in China, and an important central city in southwest China.