*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 Year:*(i). Every year divisible by 4 is a leap year, if it is not a century.(ii). Every 4

^{th}century is a leap year and no other century is a leap year.Note:

*A leap year has 366 days.**Examples:*- Each of the years 1948, 2004, 1676 etc. is a leap year.
- Each of the years 400, 800, 1200, 1600, 2000 etc. is a leap year.
- None of the years 2001, 2002, 2003, 2005, 1800, 2100 is a leap year.

*Ordinary Year:*The year which is not a leap year is called an*ordinary years*. An ordinary year has 365 days.*Counting of Odd Days:*- 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.

*Day of the Week Related to Odd Days:*

No. of days: 0 1 2 3 4 5 6 Day: Sun. Mon. Tues. Wed. Thurs. Fri. Sat. #### What was the day of the week on 17th June, 1998?

Correct! Wrong!#### What will be the day of the week 15th August, 2010?

Correct! Wrong!#### Today is Monday. After 61 days, it will be:

Correct! Wrong!#### If 6th March, 2005 is Monday, what was the day of the week on 6th March, 2004?

Correct! Wrong!#### The last day of a century cannot be

Correct! Wrong!QUIZ ON CALENDARGREAT JOB!!!!!Share your Results: