Calendar helps us to see the dates and along with that the week day of that same dates.

Given below is the calendar for the year 2015.

There are 12 months in a year.

We know that there are 12 months in a year. The months of January, March, May, July, August, October and December have 31 days. The months of April, June, September and November have 30 days. The month of February has 28 or 29 days.

i.e.,

All the months do not have the same number of days.

To remember the number of days in different months you may
recite the rhyme.

“Thirty days have September,

April, June and November.

February alone has twenty-eight.

All the rest have thirty one.

But leap year comes once in four;

February then has one day more.”

**How do we find a Leap Year?**

A year which is divisible by 4 is a leap year.

In a week there are 7 days. 1 day is equal to 24 hours.

**Example:**

2002 is not divisible by 4. Therefore, 2002 is not a leap year. 2004, 2008, 2012, 2016, 2020, ........ are leap years. |

Calculating the Number of Days between Two given Dates.

We can count the number of days between the given two dates. We include the starting day and the last day in our calculation.

Riana stayed at her grandmother's house from 15^{th} July to 12^{th} August. Now long did Riana stay with her grandmother?

Days in July = 31 - 15 = 16 + 1 = 17

Days in August = 12

Total number of days = 17 + 12 = 29

Riana stayed with her grandmother for 29 days.

While calculating days, there are times when we include the first and the last day in calculations. For calculating the number of days of Riana’s stay, we subtract 15 from 31 (since there are 31 days in July) and then add 1 because; we want to include 15^{th} July in our calculation.

What will be the date 26 days after Mach 19.

Days in March = 31 - 19 = 12

Days in April = 26 - 12 = 14

The date 26 days after March 19 will be April 14.

In this example we do not need to include March 19 in the calculation since the date after March 19 is asked for.

What was the date a fortnight before 10^{th} October?

Days in October = 10

Days in September (previous month) = 14 - 10 = 4

30 - 4 = 26

The date a fortnight before 10th October was 26^{th} September.

A fortnight = 14 days.

This calculation is done in three steps.

**Step I:** Days in October.

**Step II:** Days in the previous month (September in this case).

**Step III:** Total days in September — Required number of days of September.

In this example too, the days before October 10 have to be counted. So we do not include October 10 in our calculation.

When counting the number of days before or after a given date, we do not include the given date in' our calculation, but begin counting with the day before or after the given date, as the case may be.

Questions and Answers on Calendar:

**1.** If yesterday was Friday, the day after tomorrow will be:

(i) Thursday

(ii) Friday

(iii) Saturday

(iv) Monday

**Answer:**

**1.** (iv) Monday

**2.** Nancy with her family went for a trip. They came back
after 5 weeks 4 days. How many days did they spend in the trip?

(i) 39 days

(ii) 37 days

(iii) 40 days

(iv) 24 days

**Answer:**

**2.** (i) 39 days

**3. Given below is the calendar page for the month of August 2015.**

**Study the calendar and write.**

(i) The dates falling on Saturdays

(ii) The date falling on the second Saturday

(iii) The date falling on the last Wednesday

(iv) The dates falling on Tuesdays

(v) Total number of

(a) Sundays

(b) Saturdays

(c) Mondays

**Answer:**

**3. **(i) 1, 8, 15, 22, 29

(ii) 8

(iii) 26

(iv) 4, 11, 18, 25

(v) (a) 5

(b) 5

(c) 5

**Note:**

If the first Monday falls on 3, the other Mondays fall on 10, 17, 24 and 31.

3 + 7 = 10; 10 + 7 = 17; 17 + 7 = 24; 24 + 7 = 31

That is, the day is repeated every 7 days.

**Related Concepts **

**● ****To
Measure the Length of a Line-segment**** **

**● ****Examples
on Unit of Mass or Weight**

**● ****Units
for The Measurement of Capacity**

**● ****Examples
on Measurement of Capacity**

**● ****Antemeridian
(a.m.) or Postmeridian (p.m.)**

**● ****Calendar**

**● ****Reading
and Interpreting a Calendar**

**4th Grade Math Activities**

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