Marriage in rural areas depends on the date. How was this date worked out?

In rural areas, people are generally concerned about the lunar calendar.

At first, marriage depended on the date of birth to calculate the date of marriage.

Now these are simplified. In other words, marriage depends on the single day or double day of the lunar calendar.

The so-called double day is the first day in 2.4.6.8, and so on, while a single day is an odd day.

Usually held once every two days.