In this chapter we are going to discuss the following topics with examples.

Introduction

Calendar Concepts

Examples

### CALENDAR CONCEPTS

**Ordinary Year:**

An ordinary year has 365 days. The year which is not a leap year is called an ordinary years. Example: 1999,2017

**Leap Year:**

A leap year has 366 days.

(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.

Example:1948, 2004,1200, 1600, 2000 is a leap year.

1800, 2100 is a not a leap year.

**Odd Day calculation:**

Number of days more than the complete weeks are called odd days.

For Ordinary Year = 365 days = 52 weeks + 1 day (i.e *1 odd day*)

For Leap Year = 366 days = 52 weeks + 2 days (i.e *2 odd days*)

For 100 Years

100 Years = 76 ordinary Years + 24 Leap Years =(76 x 1)+ (24 x 2) = 124 odd days

= 17 weeks + 5 days = 5 odd days

For 200 Years = 5 x 2 = 10 = 3 odd days

For 300 Years = 5 x 3 = 15 = 1 odd days

For 400 Years = 5 x 4 +1=21 = 0 odd days

Year | No of Odd Days |
---|---|

Ordinary Year | 1 |

Leap Year | 2 |

100 Years | 5(Friday) |

200 Years | 3(Wednesday) |

300 Years | 1(Monday) |

400 Years | 0(Sunday) |

500 Years | 5(Friday) |

600 Years | 3(Wednesday) |

700 Years | 1(Monday) |

800 Years | 0(Sunday) |

900 Years | 5(Friday) |

1000 Years | 3(Wednesday) |

**Key Points:**

Last day of any century can’t be Tuesday, Thursday and Saturday.

Last day of any century leap year is SUNDAY.

## Goal setting should be part of your daily and weekly routines and should not be based on a calendar year or month.

Lewis Howes

**1 .The calendar 2006 will be same for the year **

**a) 2015 b) 2017 c)2009 d)2018**

Answer: b)2017

Explanation:

Count the number of odd days from the year 2007 onwards to get the sum equal to 0 odd day.

2006 -1, 2007 -1, 2008 -2, 2009-1, 2010-1, 2011-1, 2012-2, 2013-1, 2014-1, 2015-1, 2016-2, 2017-1

Total odd days from 2007-2017 = 14 days= 0 odd day

Hence 2017 calendar will be same as 2006.

**2. If 1 ^{st} Jan 2005 is Saturday then what will be 1^{st} Jan 2008?**

**a)Monday b)Friday c)Tuesday d)Saturday**

Answer: c)Tuesday

Explanation:

On 31st December it was Friday.Number of Odd days between 2006 and 2008 = (1+1)=2days

Then December 31st 2007 will be Monday then 1st Jan 2008 will be Tuesday.

**3. What will be the day on week 4th April 2001?**

**a)Sunday b)Monday c)Wednesday d)Friday**

Answer: c) Wednesday

Explanation:

April 4th 2001 =(2000 years+Period of 1.1.2001 to 4.4.2001)

Odd days in 2000 years = 0 days

From January to April 4

Total no.of.days:31+28+31+4=94 days =(13 weeks +3 days)=3 odd days

So the day will be Wednesday

Thus in this post we learned about the concepts of calendar and the problems based on calendar concept with examples.

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