Calendar
Odd days: Number of days in a year apart from complete weeks. each year will have 1 incomplete week at the end.
An ORdinary year has 365 days, a leap year has 366 days.
A Week has 7 days, A Year has 52 weeks.
52 Weeks is equal to 364 days. Thus, an ordinary year will have 1 odd day, and a leap year has 2 odd days.
Leap Year:
Every 4th year is a leap year, Except for:
- Every 100th year is not a leap year.
- However, every 400th year is a leap year.
Number of odd days in 100 years = 5
Number of odd days in 200 years = (5×2)%7 = 10%7 = 3
Number of Days in each Month:
January: 31
February: 28 or 29(leap year)
March: 31
April: 30
May: 31
June: 30
July: 31
August: 31
September: 30
October: 31
November: 30
December: 31