When is it unlucky?

Yin Shi. According to the search of the constellation Baba, ancient China divided a day and night into twelve sections, each of which has one hour, which is now two hours. Every hour has a fixed name, and the first hour starting at eleven o'clock in the evening is from eleven o'clock to midnight. B The auspicious time of the last day is Yin Shi, that is, between 3 am and 5 am.