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Easter- source

You are here: irt.org | Articles | JavaScript | Date and Time | Easter [ previous next ]

Published on: Saturday 6th December 1997 By: Martin Webb

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function y2k(number)    { return (number < 1000) ? number + 1900 : number; }

var today = new Date();
var year = y2k(today.getYear());
//--></SCRIPT>

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<LINK REL=STYLESHEET HREF="../../utility/main.css" TYPE="text/css">

<SCRIPT LANGUAGE="JavaScript"><!--
function ChosenDate(object) {
    year = object.year.value;

    if (parent.location.href != window.location.href) {
        parent.year = year;
        parent.outputFrame.location.href = 'output.htm';
    }
    else {
        return true;
    }

    return false;
}

function y2k(number)    { return (number < 1000) ? number + 1900 : number; }

var today = new Date();
var thisYear = y2k(today.getYear());

var yearOutput = '<INPUT TYPE="TEXT" NAME="year" SIZE="4" VALUE="' + thisYear + '">';
//--></SCRIPT>

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<H2>Select year:</H2>

<FORM NAME="inputDateForm" ACTION="output.htm" onSubmit="return ChosenDate(document.inputDateForm);">

Year:
<SCRIPT LANGUAGE="JavaScript"><!--
document.write(yearOutput);
//--></SCRIPT>

<INPUT TYPE="SUBMIT" VALUE="Show">
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output.htm

<HTML>
<HEAD>

<SCRIPT LANGUAGE="JavaScript"><!--
function Easter(Y) {
    var C = Math.floor(Y/100);
    var N = Y - 19*Math.floor(Y/19);
    var K = Math.floor((C - 17)/25);
    var I = C - Math.floor(C/4) - Math.floor((C - K)/3) + 19*N + 15;
    I = I - 30*Math.floor((I/30));
    I = I - Math.floor(I/28)*(1 - Math.floor(I/28)*Math.floor(29/(I + 1))*Math.floor((21 - N)/11));
    var J = Y + Math.floor(Y/4) + I + 2 - C + Math.floor(C/4);
    J = J - 7*Math.floor(J/7);
    var L = I - J;
    var M = 3 + Math.floor((L + 40)/44);
    var D = L + 28 - 31*Math.floor(M/4);

    return padout(M) + '.' + padout(D);
}

function padout(number) { return (number < 10) ? '0' + number : number; }

function getMM(string)  { return eval(string.substring(0,2)); }

function getDD(string)  { return eval(string.substring(3,5)); }

function makeArray()    {
    this[0] = makeArray.arguments.length;
    for (i = 0; i<makeArray.arguments.length; i++)
        this[i+1] = makeArray.arguments[i];
}

var accumulate    = new makeArray(  0, 31, 59, 90,120,151,181,212,243,273,304,334);
var accumulateLY  = new makeArray(  0, 31, 60, 91,121,152,182,213,244,274,305,335);

function LeapYear(year) {
    if ((year/4)   != Math.floor(year/4))   return false;
    if ((year/100) != Math.floor(year/100)) return true;
    if ((year/400) != Math.floor(year/400)) return false;
    return true;
}

function daysinyear(year) { if (LeapYear(year)) return 366; else return 365; }

function addDays(day,month,year,addition) {
    if (LeapYear(year)) var number = day + accumulateLY[month] + addition;
    else                var number = day + accumulate[month]   + addition;

    var days = daysinyear(year);
   
    while (number > days) {
        number -= days;
        days = daysinyear(++year);
    }

    while (number < 1) {
        days = daysinyear(--year);
        number += days;
    }

    month = 1;

    if (LeapYear(year)) {
        while (number > accumulateLY[month]) { month++; }
        day = number - accumulateLY[--month];
    }
    else {
        while (number > accumulate[month]) { month++; }
        day = number - accumulate[--month];
    }

    return year + '.' + padout(month) + '.' + padout(day);
}

function getYYYY(string) {
    return eval(string.substring(0,string.indexOf('.')));
}

function getMMDD(string) {
    return string.substring(string.indexOf('.')+1,string.length);
}

var daysofweek   = new makeArray('Sunday',
                                 'Monday',
                                 'Tuesday',
                                 'Wednesday',
                                 'Thursday',
                                 'Friday',
                                 'Saturday');

var monthsofyear = new makeArray('January',
                                 'February',
                                 'March',
                                 'April',
                                 'May',
                                 'June',
                                 'July',
                                 'August',
                                 'September',
                                 'October',
                                 'November',
                                 'December');

function DayOfWeek(day,month,year) {
    var a = Math.floor((14 - month)/12);
    var y = year - a;
    var m = month + 12*a - 2;
    var d = (day + y + Math.floor(y/4) - Math.floor(y/100) + Math.floor(y/400) + Math.floor((31*m)/12)) % 7;
    return d+1;
}

function Nths(day) { 
    if (day == 1 || day == 21 || day == 31) return 'st';
    if (day == 2 || day == 22) return 'nd';
    if (day == 3 || day == 23) return 'rd';
    return 'th';
}

function FullDate(day,month,year) {
    return daysofweek[DayOfWeek(day,month,year)] +' '+ day + Nths(day) +' '+ monthsofyear[month] +' '+ year;
}
//--></SCRIPT>

</HEAD>

<BODY><CENTER>

<SCRIPT LANGUAGE="JavaScript"><!--

if (location.search.length == 0)
    var year = parent.year - 0;
else
    var year  = location.search.substring(6) - 0;

var easter = Easter(year);
var easterDay = getDD(easter);
var easterMonth = getMM(easter);

var when = addDays(easterDay,easterMonth,year,-63);
document.write('Septuagesima Sunday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,-56);
document.write('Sexagesima Sunday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,-49);
document.write('Shrove Sunday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,-47);
document.write('Shrove Tuesday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,-46);
document.write('Ash Wednesday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,-14);
document.write('Passion Sunday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,-7);
document.write('Palm Sunday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,-3);
document.write('Holy or Maundy Thursday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,-2);
document.write('Good Friday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

document.write('Easter Sunday - ' + FullDate(easterDay,easterMonth,year)+'<BR>');

var when = addDays(easterDay,easterMonth,year,35);
document.write('Rogation Sunday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,39);
document.write('Ascension Day - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,49);
document.write('Pentecost or Whitsunday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,50);
document.write('Whitmundy - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,56);
document.write('Trinity Sunday - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,60);
document.write('Corpus Christi - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');

var when = addDays(easterDay,easterMonth,year,63);
document.write('Corpus Christi (Catholic Church in the United States) - ' + FullDate(getDD(getMMDD(when)),getMM(getMMDD(when)),getYYYY(when))+'<BR>');
//--></SCRIPT>

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