How to calculate the date and birthday?

In order to calculate the date of birth, it is necessary to know the exact date of birth, month, day, hour, minute and even the latitude and longitude of the place of birth. Before the sixties and seventies, it was necessary to understand the principle of eight-character arrangement and use perpetual calendar reference books to calculate the date of birth. With the development of modern high technology, it is very simple to calculate the date of birth. As long as you know the relevant information about your birth, you can quickly and accurately calculate the date of birth with the professional eight-character typesetting tool of your computer or mobile phone. For example, a man was born at 20: 30 pm on April 1955, and was born in xiuying district, Haikou City, Hainan Province. The dates of birth calculated by using the online eight-character arrangement system on the Internet are: B, E, C and C.