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date_get_easter

This algorithm was first printed in Nature, April 20, 1876. It was submitted by an unidentified reader with no more clarification than you see here.

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date_get_easter(year)
Returns the date-time of Easter for the given year.
COPY/// @func   date_get_easter(year)
///
/// @desc   Returns the date-time of Easter for the given year.
///
/// @param  {real}      year        calendar year
///
/// @return {string}    date of Easter
///
/// GMLscripts.com/license

function date_get_easter(year) 
{
    var a = year mod 19;
    var b = year div 100;
    var c = year mod 100;
    var d = b div 4;
    var e = b mod 4;
    var f = (b+8) div 25;
    var g = (b-f+1) div 3;
    var h = (19*a+b-d-g+15) mod 30;
    var i = c div 4;
    var k = c mod 4;
    var l = (32+2*e+2*i-h-k) mod 7;
    var m = (a+11*h+22*l) div 451;
    var month = (h+l-7*m+114) div 31;
    var day = ((h+l-7*m+114) mod 31)+1;
    return date_create_datetime(year, month, day, 0, 0, 0);
}

Contributors: xot

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