1. During the day, you can taste all kinds of delicious food and special snacks in niujie, such as cream fried cake, pea yellow and mung bean cake. Since most stalls close at around 9 pm, daytime is a good time to taste these delicious foods. Besides, you can also enjoy the architectural scenery of niujie and feel the strong Islamic customs.

2. Night: The night view of niujie is also charming, with bright lights and various customs. After six o'clock in the evening, all kinds of halal food stalls in niujie began to open. In addition, there are some night markets and food stalls, so that you can also taste authentic Beijing snacks at night. Therefore, the evening is also a good time to visit niujie.

Generally speaking, niujie is a place worth visiting, whether it is day or night. You can choose the right time to visit according to your personal schedule.