- 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.

# Calendar - Important Formulas | Aptitude

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