a serious problem – DayLight.One Review

I have a serious problem using it. I live in China. The app works perfectly in showing the daylight hours of cities in China, but it can not show cities of other countries. For example, if I search for Paris in the searching bar, and tap the city Paris, Paris just will not show up in the Places list. What is this problem?
Review by Liuhunjijiu on DayLight.One.