Calendar Aptitude for campus placement

Aptitude

Aptitude without Attitude is Blind;
Attitude without Aptitude is Lame.

Calendar Basics and Short Tricks for Calendar Questions

1 Week = 7 Days

1 Ordinary Year = 365 Days =52 Days + 1 odd days

1 Leap Year = 366 Days = 52 Days + 2 odd days

Odd Days

We are supposed to find the day of the week on a given date. For this, we use the concept of ‘odd days’. In a given period, the number of days more than the complete weeks are called odd days.

Leap Years

(i) Every year divisible by 4 is a leap year if it is not a century.

(ii). Every 4th century is a leap year and no other century is a leap year.

Ordinary Year​​

The year which is not a leap year is called an ordinary year. An ordinary year has 365 days.

How to solve calendar problem within 30 second

Step:-1

Code for weekdays

Sunday 0
Monday 1
Tuesday 2
Wendesday 3
Thrusday 4
Friday 5
Saturday 6

Step 2:- Code for Month

Calender Aptitude Short Code

Step 3:- Code for years

1600-1699  6  
1700-1799  4
1800-1899  2
1900-1999  0
2000-2099  2

Let’s solve questions

(1) What was the day of the week on 26 January 1947

Last 2 digit of the year47
Last 2 digit of year divide by 4 and put quotation (47/4)11
Code of year0
Code of month0
Date26

Sum of all five quantity 47 + 11 + 27 + 0 + 0 = 84

Answer divided by 7 and see remainder and compare with the table of weekdays

84/7 = 0 Sunday

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  • 1 ordinary year = 365 days = (52 weeks + 1 day.) 1 ordinary year has 1 odd day.
  • 1 leap year = 366 days = (52 weeks + 2 days) 1 leap year has 2 odd days.
  • 100 years = 76 ordinary years + 24 leap years = (76 x 1 + 24 x 2) odd days = 124 odd days. = (17 weeks + days) = 5 odd days.
  • Number of odd days in 100 years =5.
  • Number of odd days in 200 years = (5 x 2) = 3 odd days.
  • Number of odd days in 300 years = (5 x 3) = 1 odd day.
  • Number of odd days in 400 years = (5 x 4 + 1) = 0 odd day.
  • Similarly, each one of 800 years, 1200 years, 1600 years, 2000 years etc. has 0 odd days.
  • You can see the 5 ,3,1,0 are last day of year and last day of century cannot be Tuesday, Thrusday and saturday ( You can see Weekday Code Table )

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Calendar Aptitude for Campus Placement
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