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Use this JavaScript to figure out when Easter Sunday will be in a given year. The timing of the holiday depends on the full moon.

Label: Calculator for Easter Sunday

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<script type="text/javascript">
<!-- Begin
// Created by: Matthew Ogden , ogden1972@earthlink.net | http://www.home.earthlink.net/~ogden1972/
function d()
{
var a = document.form1.year.value;
a=a*1
if (a >= 2100) c=5;
if (a < 2100) c=6;
if (a > 2199) alert("you must enter a date between 1583 - 2199");
if ( a<=1582) alert("you must enter a date between 1583 - 2199");
 s = a/4
var b = Math.floor( s ) ;
sn=(b+a+c)/7
var d = Math.floor( sn ) ;
sundaynumber = (sn-d)*7
m =(a*1)+1
g = m/19
var e = Math.floor( g ) ;
var goldennumber = (g-e)*19;
var sundaynumber= Math.round(sundaynumber) ;
if(a>2199) sundaynumber=7;
if(a<=1582) sundaynumber=7;
var goldennumber= Math.round(goldennumber) ;

var t1= "April 16April 17April 18April 19April 20April 21April 15" ;
var t2= "April  9April 10April  4April  5April  6April  7April  8" ;
var t3= "March 26March 27March 28March 29March 30March 24March 25" ;
var t4= "April 16April 17April 18April 12April 13April 14April 15" ;
var t5= "April  2April  3April  4April  5April  6April  7April  1";
var t6= "April 23April 24April 25April 19April 20April 21April 22" ;
var t7= "April  9April 10April 11April 12April 13April 14April 15" ;
var t8= "April  2April  3April  4March 29March 30March 31April  1";
var t9= "April 23April 17April 18April 19April 20April 21April 22" ;
var t10= "April  9April 10April 11April 12April  6April  7April  8" ;
var t11= "March 26March 27March 28March 29March 30March 31April  1" ;
var t12= "April 16April 17April 18April 19April 20April 14April 15" ;
var t13= "April  9April  3April  4April  5April  6April  7April  8" ;
var t14= "March 26March 27March 28March 29March 23March 24March 25" ;
var t15= "April 16April 17April 11April 12April 13April 14April 15" ;
var t16= "April  2April  3April  4April  5April  6March 31April  1" ;
var t17= "April 23April 24April 18April 19April 20April 21April 22" ;
var t18= "April  9April 10April 11April 12April 13April 14April 8" ;
var t19= "April  2April  3March 28March 29March 30March 31April  1" ;

if (goldennumber == 1) chart=t1;
if (goldennumber == 2) chart=t2;
if (goldennumber == 3) chart=t3;
if (goldennumber == 4) chart=t4;
if (goldennumber == 5) chart=t5;
if (goldennumber == 6) chart=t6;
if (goldennumber == 7) chart=t7;
if (goldennumber == 8) chart=t8;
if (goldennumber == 9) chart=t9;
if (goldennumber == 10) chart=t10;
if (goldennumber == 11) chart=t11;
if (goldennumber == 12) chart=t12;
if (goldennumber == 13) chart=t13;
if (goldennumber == 14) chart=t14;
if (goldennumber == 15) chart=t15;
if (goldennumber == 16) chart=t16;
if (goldennumber == 17) chart=t17;
if (goldennumber == 18) chart=t18;
if (goldennumber == 19) chart=t19;

if (sundaynumber==0)  document.form1.date.value = (chart.substring(0,8) )+", "+a;
if (sundaynumber==6) document.form1.date.value = (chart.substring(8,16) )+", "+a;
if (sundaynumber==5)  document.form1.date.value = (chart.substring(16,24) )+", "+a;
if (sundaynumber==4)  document.form1.date.value = (chart.substring(24,32) )+", "+a;
if (sundaynumber==3)  document.form1.date.value = (chart.substring(32,40) )+", "+a;
if (sundaynumber==2)  document.form1.date.value = (chart.substring(40,48) )+", "+a;
if (sundaynumber==1)  document.form1.date.value = (chart.substring(48,56) )+", "+a;
if(sundaynumber==7) document.form1.date.value = "error";
}
// End -->

</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<form Name="form1">
Year:  <input type="text" name="year" size="15">    
Date:  <input type="text" name="date" readonly size="15">
<br><br>
<input Type="button" value="Calculate" onclick="d()">    
<input type="Reset" value="Clear">    
<input Type="button" value="Print" onclick="window.d();print()">
</form>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->