**Days of the Weeks**

- There are
**seven**days in a week. - Given below are the names of the days in a week.

** Months**

- There are 12 months in a year.
- Each month has either 28, 29, 30, or 31 days.
- Each month has either 4 or 5 weeks.
- Given below are the names of the month in a year along with the number of days.
- There are
**365**days or**366**days in a year. - January and December are the first and the last month of the year.
- February is the shortest month of the year.

** Calendar**

- A calendar is a chart of pages that represents the days, weeks, and months of a specific year.
- With the help of the calendar, we can keep the track of the events such as exam, vacations, festivals, etc.
- Given below is the calendar for the year 2022.

** Leap Year**

- To maintain the calendar in alignment with the earth’s revolution around the sun a leap day is required.
- A leap day is a day added to the shortest month, i.e., February in the leap year.
- In an ordinary year, February has 28 days but in a leap year, February has 29 days.
- Therefore, in a leap year there are 366 days that occur every fourth year.

**Method to check if the year is a leap year or not a leap year:**

To check if the year is the leap year, divide the year by 4. If it is completely divisible by 4 then the year is the leap year.

**For example,**2024 when divided by 4 leaves no remainder. Therefore, 2024 was a leap year.

Exception:To check if the century year is a leap year, divide the year by 400. If it is divisible by 400 then the year is a leap year.

**For example,**2000 when divided by 400 leaves no remainder. Therefore, 2000 was a leap year.

** Dates**

The calendar helps us to keep a record of the time of the events in the form of dates.

Look below the format of the dates.

- DD: It represents the days of the month. It can vary from 01 to 31.
- MM: It represents the months of the year. It can vary from 01 to 12.
- YY: It represents the last two digits of the year.

**For example,** The 28 March 2022 can be written as **03/ 28/ 22** or **03/28/2022**.

** Ordinal Numbers**

- An ordinal number is defined as the number which describes the position in the series.
- For example, 1 is written as “first” or 1st; 2 is written as second or 2nd, and so on.
- We use the ordinal number to write a date.
- For example, 25/12/20 is written as 25th of December 2020.
- The list of ordinal numbers from days 1 to 31 is shown below:

**Did you know?**

**Fun facts:**

The sum of the number of days in 5 consecutive months (excluding February) is always equal to 153.

For example:

March: 31

June: 30

July: 31

August 31

September: 30

Sum = 31 + 30 + 31 + 31 + 30 = 153.