Calendar Important Formulas for Aptitude
Ordinary Year
365 days = 52 weeks + 1 day
it has 1 odd day
for eg:- Jan 1 2005 is Saturday then Jan 1 2006 would be Sunday as the difference in year is one and both are Ordinary Year
Year Difference Day
Jan 1 2005 - Saturday
Jan 1 2006 2006-2005 = 1 Sunday
Jan 1 2007 2007-2005 = 2 Monday
Leap Year
366 days = 52 weeks + 2 day
it has 2 odd day
for eg:-
Year Odd Days Day Year Type
Jan 1 2005 1 Saturday Ordinary Year
Jan 1 2006 1 Sunday Ordinary Year
Jan 1 2007 1 Monday Ordinary Year
Jan 1 2008 2 Tuesday Leap Year
Jan 1 2009 1 Thursday Ordinary Year
1.A year is a Leap year if a year is not a century year the & It is divisible by 4
2. A year is a Leap year if a century year is divisible by 400
For eg:-
1900 - Ordinary Year
1900 is a Centuary Year
So divide 1900 by 400 But , 1900 is not divisible by 400.
2006 - Ordinary Year
2006 is not a century year
So divide 2006 by 4 But, 2006 is not divisible by 4
2004 - Leap Year
2004 is not a century year
So divide 2004 by 4 & 2004 is divisible by 4
2000 - Leap Year
2000 is a Centuary Year
So divide 2000 by 400 & 2000 is divisible by 400.
For eg:-
Today is Sunday. After 94 days, it will be:
Step 1:- Divide no of days by 7
94 / 7 =13
remainder is 3
Step 2:- if today is Sunday then 91st day would be Sunday
Step 3:- Sunday + 3 days = Wednesday
So If today is Sunday then after 94 days it will be Wednesday.
Shortcut:-
No of Days 0 1 2 3 4 5 6
Day Sun Mon Tue Wed Thu Fri Sat
Today is Friday After 86 days it will be:-
86/7 = 12
Remainder 2
Friday + 2 days =Sunday
Year
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