## A Conversation for Calculating the Date of Easter

### MATLAB code for Easter

AlexAshman Started conversation Dec 15, 2006

Here it is - have fun...

function [] = easter(Year)

% Converted to MATLAB code by AlexAshman, h2g2.com researcher, in 2006

% Given the Year as a four digit number in the range 1700 - 2299

% Calculate Day and Month of Easter Sunday

% Note 1: the algorithm has not been tested outside this range.

% Note 2: the date returned is the Gregorian Calendar date

% (the one we use now), even for dates in the 18th Century.

if Year == 33

disp('Now that would be telling...')

return

end

if Year>2299|Year<1700

disp('Year outside tested range - please enter a number between 1700 and 2299')

return

end

a = mod(Year,19);

b = fix(Year/100);

c = mod(Year,100);

d = fix(b/4);

e = mod(b,4);

f = fix(c/4);

g = mod(c,4);

h = (b + 8);

h = fix(h/25);

i = (b - h + 1);

i = fix(i/3);

j = (19*a + b - d - i + 15);

j = mod(j,30);

k = (32 + 2*e + 2*f - j - g);

k = mod(k,7);

m = (a + 11*j + 22*k);

m = fix(m/451);

n = j + k - 7*m + 114;

Month = fix(n/31);

Day = mod(n,31) + 1;

switch Month

case 3

Mstring = 'March';

case 4

Mstring = 'April';

otherwise

end

s = struct('Easter', Year, 'Will', 'be on the following date' ,'Month', Mstring, 'Day', Day)

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