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Example How Many Months Have 28 Days

Units of Measure / How Many Months Have 28 Days

The Gregorian calendar

The Gregorian calendar was introduced on February 24, 1582, by the decree of Pope Gregory XIII. The calendar was named in his honor, but it is also known as the Christian (or Western) calendar. It was adopted later by other countries, though it took centuries for some of them.

The new variant was needed because the Julian calendar stated that there was 365.25 days between vernal equinoxes, though this time is eleven minutes shorter. The result of this error equals to approximately three days in four centuries. The Gregorian calendar corrected the mistake and modified the leap years

This table shows how many days every month has according to the Gregorian calendar.

Month

Days

January

31

February

28, or 29

March

31

April

30

May

31

June

30

July

31

August

31

September

30

October

31

November

30

December

31

The mean length of the month in the Gregorian calendar is equal to 30.436875 days.

According to the table below, only one month (February in a common year) consists of 28 days. But does it mean that all the other eleven months do not have 28 days? A tricky question, isn’t it?

In fact, all the twelve months in every year (including leap years) have 28 days. Of course, almost all of them have also the 29

The following video will teach you the simple way to find out how many days every month of a year has:

- The month is a time unit used in calendars. The Gregorian calendar consists of twelve months, which have from 28 to 31 days.
- The leap year is an uncommon year that contains one additional day (in some calendars – a month) to synchronize the calendar year with the seasonal (or astronomical) year. In the Gregorian calendar, it usually happens once in four years and leap years last 366 days (February has one more day). If a year is evenly divided by 100 and not divided by 400, it is not a leap year. For example, 2000 was a leap year, but 2100 will not be a leap year.

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