Aptitude - Calendar - Discussion

I would like to know , how many leap years are there in 99 years and 100 years.

i.e How to calculate number of leap years from 'n' number of years ?

I too want to know the same.

Centuries Table

1700-1799 4
1800-1899 2
1900-1999 0
2000-2099 6
2100-2199 4
2200-2299 2
2300-2399 0
2400-2499 6
2500-2599 4
2600-2699 2

Months Table:

January 0 (in leap year 6)
February 3 (in leap year 2)
March 3
April 6
May 1
June 4
July 6
August 2
September 5
October 0
November 3
December 5
Days Table:

Sunday 0
Monday 1
Tuesday 2
Wednesday 3
Thursday 4
Friday 5
Saturday 6


For example

April 24,1982.

1. Look up the 1900s in the centuries table: 0
2. Note the last two digits of the year: 82
3. Divide the 82 by 4: 82/4 = 20.5 and drop the fractionalpart: 20
4. Look up April in the months table: 6
5. Add all numbers from steps 1-4 to the day of the month (in this case, 24): 0+82+20+6+24=132.
6. Divide the sum from step 5 by 7 and find the remainder: 132/7=18 remainder 6
7. Find the remainder in the days table: 6=Saturday.

Thanks pavithra

Sridhar my quetion for you how you wrote century table we have to remember that or else is there any calculation but your expalanation so nice I have that doubt only, so please clarify that and before 1700 how you know value ?

365 day = 1 year, day364/7days = 54weeks, balance 1 day that will be conce considered as ODD days.

If it is leap year total no of days for = 366, 364/7 = 54 weeks balnce 2 days.

Sridhar my quetion for you how you wrote century table we have to remember that or else is there any calculation but your expalanation so nice I have that doubt only, so please clarify that and before 1700 how you know value ?

It is Thursday on 25th of September. What day will it be on the 25th of October in the same year?

@Sridhar, how we know the centuries table value or months table value?

Hi could you please explain clearly formula to find the day of the week.

Hi friends,

There are 52 weeks in a year.And there are 7 days a week.So, the closest factor of 7 is 49.And 52-49=3.So after 49 days again there will be Sunday.So,add 3 days to Sunday that is Wednesday.Now similarly continuously add 3 days for 4 times as there is difference of 4 years between 2010 & 2006.

Therefore the ans is "FRIDAY".