Most of us remember our birthdays but not our birth day! One way to calculate this is to use a formula called **Zellers Congruence**. The formula is

day = (abs(2.6m – 0.2) + k + y + (y div 4) + (c div 4) – 2c)) mod 7

The result will be a number in the range 1 to 7. Print out the day if Sunday =1, Monday = 2, etc

The variables are:

- m = month. Take January as month 10, February and month 11, and March as month 1, etc. December will be 10.
- k = the day of the month
- c = the century (i.e. 20 in 2006)
- y = the year (i.e. the 06 in 2006)

Can you write a program that calculates the day that you were born on?

*Credit Blundell@MonktonCoombe*