The calendar

Calculating Easter (for dates between 1900 and 2099)

What year do you want to work out the date for?

Work out d the difference between that year and 1900.

d =

Calculate the remainder, r when d is divided by 19.

r =

7 x r + 1 =
Calculate Qhow many times the answer to the above calculation goes into 19.

q =

11 x r + 4 - q =
Calculate R the remainder when the answer to the above calculation is divided by 29.

R =

Calculate the quotient Q for d divided by 4.

Q =

d + Q + 31 - R =

Calculate F the remainder when the answer to the above calculation is divided by 7.

F =

N = 25 - R - F =

If N > 0, then Easter is on the N^th April.
If N < 0 , then Easter is on the 31 - N^th March.

Easter was on