Calculation method: First calculate the number of days between two given dates, and then divide the result by 7. If there is a remainder, add the number of days of the remainder to the original basis and then calculate; If there is no remainder, it will not change.

For example, today is Wednesday, May 28th, 20 16. What day is July 28th, 20 18? ?

The day of 16 is not counted, and it is counted from May 16 to July 28th.

(1) Calculates the number of days between two given dates:

Days in May: 3 1- 16= 15 days; The number of days in June is 30; The number of days in July is 28.

How many days are there in a * * *: 15+30+28=73 days? .

(2) Divide the number of days obtained by 7:

73÷7= 10 (last week) ... 3 days? .

(3) What is the remainder? Add the remaining days to the original days.

Since the day of 16 is not included, how many days are counted from the day after 16: Thursday, Friday and Saturday.

So July 28th, 20 18 is Saturday.

Extended data:

Zhou was called the Seven Obsidian in ancient China. During the Xia, Shang and Zhou Dynasties in China, Seven Obsidian refers to seven main stars, such as the sun, the moon and the five major planets, which was an important part of astronomical astrology at that time. Later, one week was borrowed as a unit of seven days, so it was called a week. Week, also called week, is a unit of time, and it is also the basis for formulating working days and rest days now.