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What grade and semester is the year, month and day?
Year, month and day are the contents of the next semester of Grade Three.

The knowledge points of the third grade elementary school mathematics volume II are classified as follows:

1, commonly used time units are: (hour, minute, second), (year, month, day).

2. 1 year = 12 months 1 day = 24 hours 1 hour = 60 minutes 1 minute = 60 seconds 1 week = 7 days.

3. There are 12 months in a year, including 7 big months, with 3 1 day per month; Abortion lasts for 4 months, with 30 days each month; Sometimes February has 28 days, and sometimes it has 29 days.

There are two ways to judge a flat leap year: the first way is to look at February: there are 28 days in a flat year and 29 days in a leap year. The second method is to divide the year by 4 (integer 100 divided by 400), and the remainder is the average year and the remainder is the leap year.

There is a leap year every three normal years, that is, a leap year every four years. Only leap years have February 29th.

6. The average year is 365 days (365,438+0× 7+30× 4+28 = 365), and the leap year is 52 weeks, 65,438+0 days and 366 days (365,438+0× 7+30× 4+29 = 366).

7, 135780 wax, 3 1 day is not bad, 469 winter 30 days, only February 28, every leap day in four years, it must be added to February.