In which years is February 28 days?

200 1, 2002, 2003, 2005, 2006, 2007, 2009, 20 10, 20 1 1, 20 13, 20 14, 2006.

February is the second month of the solar year, with 28 days in a normal year and 29 days in a leap year. There have been three times in history, and there are 30 days in February. In the northern hemisphere, February is the third month of winter. This month's solar terms are: beginning of spring, it rains. February in English comes from February in ancient Rome and may also come from Sabine.

The establishment of leap year is to make up for the time difference between the number of days in a year and the actual period of revolution of the earth caused by man-made calendar regulations. The year to make up for the time difference is leap year. There are 366 days in leap year and 29 days in February.

Extended data:

February has 28 days:

This is caused by two dictators in history. In 46 BC, Julius Caesar, the great Roman dictator, presided over the formulation of the "julian calendar (Gregorian calendar)". After some sorting and calculation, it is determined that a year is divided into 12 months, and each month is 3 1 day, whichever is the big month. Every two months is 30 days, abortion.

In this way, the leap year is exactly 366 days, and the average year is one day longer than the revolution time of the earth, so a month is reduced by one day. From that day on? According to the rules of the Roman court, all the prisoners on death row in the country were executed in February. The Romans regarded February as a "bad month" and of course hoped that the shorter it was, the better. So I decided to subtract one day from February, only 29 days.