# Aptitude - Calendar

- Calendar - Formulas
- Calendar - General Questions

**If 6**what was the day of the week on 6

^{th}March, 2005 is Monday,^{th}March, 2004?

The year 2004 is a leap year. So, it has 2 odd days.

But, Feb 2004 not included because we are calculating from March 2004 to March 2005. So it has 1 odd day only.

The day on 6^{th} March, 2005 will be 1 day beyond the day on 6^{th} March, 2004.

Given that, 6^{th} March, 2005 is Monday.

6^{th} March, 2004 is Sunday (1 day before to 6^{th} March, 2005).

^{st}April, 2001.

1^{st} April, 2001 = (2000 years + Period from 1.1.2001 to 1.4.2001)

Odd days in 1600 years = 0

Odd days in 400 years = 0

Jan. Feb. March April

(31 + 28 + 31 + 1) = 91 days 0 odd days.

Total number of odd days = (0 + 0 + 0) = 0

On 1^{st} April, 2001 it was Sunday.

In April, 2001 Wednesday falls on 4^{th}, 11^{th}, 18^{th} and 25^{th}.

*x*weeks

*x*days?

*x* weeks *x* days = (7*x* + *x*) days = 8*x* days.

100 years contain 5 odd days.

Last day of 1^{st} century is Friday.

200 years contain (5 x 2) 3 odd days.

Last day of 2^{nd} century is Wednesday.

300 years contain (5 x 3) = 15 1 odd day.

Last day of 3^{rd} century is Monday.

400 years contain 0 odd day.

Last day of 4^{th} century is Sunday.

This cycle is repeated.

Last day of a century cannot be Tuesday or Thursday or Saturday.

^{th}Feb, 2005 it was Tuesday. What was the day of the week on 8

^{th}Feb, 2004?

The year 2004 is a leap year. It has 2 odd days.

The day on 8^{th} Feb, 2004 is 2 days before the day on 8^{th} Feb, 2005.

Hence, this day is Sunday.