When will it get dark after beginning of autumn?

"In early autumn, it usually gets dark after half past six. Although beginning of autumn marks the beginning of autumn, it is still very hot after beginning of autumn. After beginning of autumn, there is "Autumn", and "Autumn Tiger" still exists. So pay attention to heatstroke prevention. However, a leopard cannot change his spots. There is a "sweet day" that is hot at noon and cool in the morning and evening, and there is a saying that "one autumn rain is cold and ten autumn rains are frost".