9:00 - 2 1:00。 Official website of Dongguan Library shows that the study room of Dongguan Library is open at 9:00-2 1:00 on Tuesdays, Thursdays, Wednesdays, Saturdays and weekends, closed on Mondays and Fridays, and open at 14: 00 in the afternoon. Dongguan Library, located in the central square of Cheng Nan Street in Dongguan, is one of the cultural landmark buildings in Dongguan.