Open around the clock, best time to visit is before dawn. The market is most lively around midnight.
Wikipedia https://zh.wikipedia.org/wiki/河口市场
地址 116 Chakphet Rd, Khwaeng Wang Burapha Phirom, Khet Phra Nakhon, Krung Thep Maha Nakhon 10200, Thailand
坐标 13°44'30.492" N 100°29'46.922" E