The Calendar can be perfectly solved by using method : C+Y+Y/4+M

2. https://unacademy.com/user/dikshiv96

3. • (4n, 366 days, Feb-29 days, 2 odd days)
• (Not Multiple of 4n, 365 days, Feb-28 days, 1 odd days)
 In case of Century Year Leap Year must be multiple of 400

6. REFERENCE YEAR:

9. Note: For monthly odd day remember the series:
3 0 (1) 3 2 3 2 3 3 2 3 2 3
J F M A M J J A S O N D
Monthly Odd Days:

10. To find Day & any random Date formula is:
Where:
Y= (Last 2 digits of year) – 1
Example : For 1947, Y is 46.
Y/4 = Non-decimal Quotient obtained by dividing
4.
Example : For 1947, Y/4 is 11.(46/4,Quotient is 11)

13. Q3.What is the day of the week on 29th May,1982?
Ans: RY= 1601
CY=1982
century=3
c=1
Y=81
(Y/4)=(81/4)=20
M =303232332323
(8+29)=37
C+Y/4+Y+M
1+81+20+37
(139/7)=6 i.e; Saturday

14. Q4 .What is the day of the week on 11th Feb 2011?
Ans: RY= 2001
CY=2011
century=1
c=0
Y=10
(Y/4)=(10/4)=2
M =(3 + 11)
=14
C+Y/4+Y+M
0 + 2 + 10 + 14
(26/7)=5 i.e ; Friday

15. Q5.What is the day of the week on 22nd Dec,1985?
Ans: RY= 1601
CY=1985
century=3
c=1
Y=84
(Y/4)=(84/4)=21
M =(3+0+3+2+3+2+3+3+2+3+2+22)
= 50
C+Y/4+Y+M
1+21+84 +50
(154/7)=0 i.e ; Sunday

16. Q6.There are five mondays and five tuesdays in the month of April in
certain non leap year. What day was Jan 1st of that year?
Ans:5 Mondays and 5 Tuesdays in April
April has 30 days i.e; 4 full weeks and 2 days.
So if there are 5 Mondays and 5 Tuesdays, therefore 29th and 30th of
the month were Monday and Tuesday.
Apr 1st=Monday. This was non leap year.
Jan-31days,Feb 28 days, Mar 31 days. The 91st day iof the year is
Monday. So the first day should have been a Tuesday.