Look at the introduction of the day.

Seeing the date, also known as "choosing the date", is one of the ancient Han folk customs. According to the ancient yellow calendar or ask Mr. Feng Shui to choose auspicious days for important things in people's lives, such as getting married, building a house, moving and burying. Although it has a certain color of feudal superstition, it is also a legacy of the traditional culture of the Han nationality. Seeing the date is still very popular in rural areas, and people living in cities still attach great importance to the date selection of marriage and housewarming. There are certain principles and customs to follow when looking at God according to Yin-Yang, Five Elements and the Yellow Calendar. In a narrow sense, choosing a day refers to a method of choosing an auspicious day and auspicious time based on the calendar of cadres and branches, calculating the good and bad luck of the year, month, day and hour, and making comprehensive reference to determine the method of avoiding evil. To put it simply, the so-called auspicious day is to choose an auspicious day according to a certain method, so it is directly called "choosing the day", "observing the day" and "picking up the day" by the people, and it was also called "dropping the day" and "calling the day" in ancient times.