Tax Deductible
To have this work on your web page, use the source code shown on this page. There are two parts of the code listed below, the script itself which must appear within the <HEAD> section of your web page, and the few lines which displays the date, which appears in the web page's <BODY> .
As with web page design in general, Shamash cannot help troubleshoot problems you have with this script. Yet if you run into problems, you may use the support email lists we have on our system for webmasters to have others help you.
This script was not created by Shamash, and must include the credits which appear in the script below. Enjoy!
<HTML>
<HEAD>
<TITLE>JavaScript Date Page in Hebrew</TITLE>
<script LANGUAGE="JavaScript">
<!-- to hide script contents from old browsers
/*
* This script was adapted from C sources written by
* Scott E. Lee, which contain the following copyright notice:
*
* Copyright 1993-1995, Scott E. Lee, all rights reserved.
* Permission granted to use, copy, modify, distribute and sell so long as
* the above copyright and this permission statement are retained in all
* copies. THERE IS NO WARRANTY - USE AT YOUR OWN RISK.
*
* Bill Hastings
* RBI Software Systems
* bhastings@rbi.com
*/
var GREG_SDN_OFFSET = 32045,
DAYS_PER_5_MONTHS = 153,
DAYS_PER_4_YEARS = 1461,
DAYS_PER_400_YEARS = 146097;
var HALAKIM_PER_HOUR = 1080,
HALAKIM_PER_DAY = 25920,
HALAKIM_PER_LUNAR_CYCLE = ((29 * HALAKIM_PER_DAY) + 13753),
HALAKIM_PER_METONIC_CYCLE = (HALAKIM_PER_LUNAR_CYCLE * (12 * 19 + 7));
var HEB_SDN_OFFSET = 347997,
NEW_MOON_OF_CREATION = 31524,
NOON = (18 * HALAKIM_PER_HOUR),
AM3_11_20 = ((9 * HALAKIM_PER_HOUR) + 204),
AM9_32_43 = ((15 * HALAKIM_PER_HOUR) + 589);
var SUN = 0,
MON = 1,
TUES = 2,
WED = 3,
THUR = 4,
FRI = 5,
SAT = 6;
var today = null,
hebrewMonth = 0,
hebrewDate = 0,
hebrewYear = 0,
metonicCycle = 0,
metonicYear = 0,
moladDay = 0,
moladHalakim = 0;
var gWeekday = new weekdayarr("Sun","Mon","Tues","Wednes","Thurs","Fri","Satur");
var gMonth = new gregmontharr("January","February","March","April","May","June","July","August","September","October","November","December");
var hMonth = new hebrewmontharr("Tishri","Heshvan","Kislev","Tevet","Shevat","AdarI","AdarII","Nisan","Iyyar","Sivan","Tammuz","Av","Elul");
var mpy = new monthsperyeararr(12,12,13,12,12,13,12,13,12,12,13,12,12,13,12,12,13,12,13);
function weekdayarr(d0,d1,d2,d3,d4,d5,d6)
{
this[0] = d0; this[1] = d1; this[2] = d2; this[3] = d3;
this[4] = d4; this[5] = d5; this[6] = d6;
}
function gregmontharr(m0,m1,m2,m3,m4,m5,m6,m7,m8,m9,m10,m11)
{
this[0] = m0; this[1] = m1; this[2] = m2; this[3] = m3;
this[4] = m4; this[5] = m5; this[6] = m6; this[7] = m7;
this[8] = m8; this[9] = m9; this[10] = m10; this[11] = m11;
}
function hebrewmontharr(m0,m1,m2,m3,m4,m5,m6,m7,m8,m9,m10,m11,m12,m13)
{
this[0] = m0; this[1] = m1; this[2] = m2; this[3] = m3;
this[4] = m4; this[5] = m5; this[6] = m6; this[7] = m7;
this[8] = m8; this[9] = m9; this[10] = m10; this[11] = m11;
this[12] = m12; this[13] = m13;
}
function monthsperyeararr(m0,m1,m2,m3,m4,m5,m6,m7,m8,m9,
m10,m11,m12,m13,m14,m15,m16,m17,m18)
{
this[0] = m0; this[1] = m1; this[2] = m2; this[3] = m3;
this[4] = m4; this[5] = m5; this[6] = m6; this[7] = m7;
this[8] = m8; this[9] = m9; this[10] = m10; this[11] = m11;
this[12] = m8; this[13] = m13; this[14] = m14; this[15] = m15;
this[16] = m16; this[17] = m17; this[18] = m18;
}
function getToday()
{
if(today == null)
today = new Date();
}
function displayWeekday()
{
getToday();
document.writeln(gWeekday[today.getDay()] + "day");
}
function displayGregorianDate()
{
getToday();
document.writeln(gMonth[today.getMonth()] + " " + today.getDate() + ", " + today.getYear());
}
function displayHebrewDate()
{
if(hebrewDate != 0 && hebrewMonth != 0 && hebrewYear != 0)
document.writeln(hebrewDate + " " + hMonth[hebrewMonth-1] + " " + hebrewYear);
}
function GregorianToSdn(inputYear,inputMonth,inputDay)
{
var year = 0,
month = 0,
sdn;
getToday();
// Make year a positive number
if (inputYear < 0)
year = inputYear + 4801;
else
year = inputYear + 4800;
// Adjust the start of the year
if (inputMonth > 2) {
month = inputMonth - 3;
}
else {
month = inputMonth + 9;
year--;
}
sdn = Math.floor((Math.floor(year / 100) * DAYS_PER_400_YEARS) / 4);
sdn += Math.floor(((year % 100) * DAYS_PER_4_YEARS) / 4);
sdn += Math.floor((month * DAYS_PER_5_MONTHS + 2) / 5);
sdn += inputDay - GREG_SDN_OFFSET;
return sdn;
}
function SdnToHebrew(sdn)
{
var inputDay,
tishri1 = 0,
tishri1After = 0,
yearLength = 0,
inputDay = sdn - HEB_SDN_OFFSET;
FindTishriMolad(inputDay);
tishri1 = Tishri1(metonicYear,moladDay,moladHalakim);
if (inputDay >= tishri1) {
// It found Tishri 1 at the start of the year.
hebrewYear = metonicCycle * 19 + metonicYear + 1;
if (inputDay < tishri1 + 59) {
if (inputDay < tishri1 + 30) {
hebrewMonth = 1;
hebrewDate = inputDay - tishri1 + 1;
}
else {
hebrewMonth = 2;
hebrewDate = inputDay - tishri1 - 29;
}
return;
}
// We need the length of the year to figure this out,so find Tishri 1 of the next year.
moladHalakim += HALAKIM_PER_LUNAR_CYCLE * mpy[metonicYear];
moladDay += Math.floor(moladHalakim / HALAKIM_PER_DAY);
moladHalakim = moladHalakim % HALAKIM_PER_DAY;
tishri1After = Tishri1((metonicYear + 1) % 19,moladDay,moladHalakim);
}
else {
// It found Tishri 1 at the end of the year.
hebrewYear = metonicCycle * 19 + metonicYear;
if (inputDay >= tishri1 - 177) {
// It is one of the last 6 months of the year.
if (inputDay > tishri1 - 30) {
hebrewMonth = 13;
hebrewDate = inputDay - tishri1 + 30;
}
else if (inputDay > tishri1 - 60) {
hebrewMonth = 12;
hebrewDate = inputDay - tishri1 + 60;
}
else if (inputDay > tishri1 - 89) {
hebrewMonth = 11;
hebrewDate = inputDay - tishri1 + 89;
}
else if (inputDay > tishri1 - 119) {
hebrewMonth = 10;
hebrewDate = inputDay - tishri1 + 119;
}
else if (inputDay > tishri1 - 148) {
hebrewMonth = 9;
hebrewDate = inputDay - tishri1 + 148;
}
else {
hebrewMonth = 8;
hebrewDate = inputDay - tishri1 + 178;
}
return;
}
else {
if (mpy[(hebrewYear - 1) % 19] == 13) {
hebrewMonth = 7;
hebrewDate = inputDay - tishri1 + 207;
if (hebrewDate > 0)
return;
hebrewMonth--;
hebrewDate += 30;
if (hebrewDate > 0)
return;
hebrewMonth--;
hebrewDate += 30;
}
else {
hebrewMonth = 6;
hebrewDate = inputDay - tishri1 + 207;
if (hebrewDate > 0)
return;
hebrewMonth--;
hebrewDate += 30;
}
if (hebrewDate > 0)
return;
hebrewMonth--;
hebrewDate += 29;
if (hebrewDate > 0)
return;
// We need the length of the year to figure this out,so find Tishri 1 of this year.
tishri1After = tishri1;
FindTishriMolad(moladDay - 365);
tishri1 = Tishri1(metonicYear,moladDay,moladHalakim);
}
}
yearLength = tishri1After - tishri1;
moladDay = inputDay - tishri1 - 29;
if (yearLength == 355 || yearLength == 385) {
// Heshvan has 30 days
if (moladDay <= 30) {
hebrewMonth = 2;
hebrewDate = moladDay;
return;
}
moladDay -= 30;
}
else {
// Heshvan has 29 days
if (moladDay <= 29) {
hebrewMonth = 2;
hebrewDate = moladDay;
return;
}
moladDay -= 29;
}
// It has to be Kislev.
hebrewMonth = 3;
hebrewDate = moladDay;
}
function FindTishriMolad(inputDay)
{
// Estimate the metonic cycle number. Note that this may be an under
// estimate because there are 6939.6896 days in a metonic cycle not
// 6940,but it will never be an over estimate. The loop below will
// correct for any error in this estimate.
metonicCycle = Math.floor((inputDay + 310) / 6940);
// Calculate the time of the starting molad for this metonic cycle.
MoladOfMetonicCycle();
// If the above was an under estimate,increment the cycle number until
// the correct one is found. For modern dates this loop is about 98.6%
// likely to not execute,even once,because the above estimate is
// really quite close.
while (moladDay < inputDay - 6940 + 310) {
metonicCycle++;
moladHalakim += HALAKIM_PER_METONIC_CYCLE;
moladDay += Math.floor(moladHalakim / HALAKIM_PER_DAY);
moladHalakim = moladHalakim % HALAKIM_PER_DAY;
}
// Find the molad of Tishri closest to this date.
for (metonicYear = 0; metonicYear < 18; metonicYear++) {
if (moladDay > inputDay - 74)
break;
moladHalakim += HALAKIM_PER_LUNAR_CYCLE * mpy[metonicYear];
moladDay += Math.floor(moladHalakim / HALAKIM_PER_DAY);
moladHalakim = moladHalakim % HALAKIM_PER_DAY;
}
}
function MoladOfMetonicCycle()
{
var r1,r2,d1,d2;
// Start with the time of the first molad after creation.
r1 = NEW_MOON_OF_CREATION;
// Calculate gMetonicCycle * HALAKIM_PER_METONIC_CYCLE. The upper 32
// bits of the result will be in r2 and the lower 16 bits will be in r1.
r1 += metonicCycle * (HALAKIM_PER_METONIC_CYCLE&0xFFFF);
r2 = r1 >> 16;
r2 += metonicCycle * ((HALAKIM_PER_METONIC_CYCLE >> 16)&0xFFFF);
// Calculate r2r1 / HALAKIM_PER_DAY. The remainder will be in r1,the
// upper 16 bits of the quotient will be in d2 and the lower 16 bits
// will be in d1.
d2 = Math.floor(r2 / HALAKIM_PER_DAY);
r2 -= d2 * HALAKIM_PER_DAY;
r1 = (r2 << 16) | (r1&0xFFFF);
d1 = Math.floor(r1 / HALAKIM_PER_DAY);
r1 -= d1 * HALAKIM_PER_DAY;
moladDay = (d2 << 16) | d1;
moladHalakim = r1;
}
function Tishri1(metonicYear,moladDay,moladHalakim)
{
var tishri1 = moladDay;
var dow = tishri1 % 7;
var leapYear = metonicYear == 2 || metonicYear == 5 || metonicYear == 7 || metonicYear == 10 ||
metonicYear == 13 || metonicYear == 16 || metonicYear == 18;
var lastWasLeapYear = metonicYear == 3 || metonicYear == 6 || metonicYear == 8 || metonicYear == 11 ||
metonicYear == 14 || metonicYear == 17 || metonicYear == 0;
// Apply rules 2,3 and 4
if ((moladHalakim >= NOON) ||
((!leapYear) && dow == TUES && moladHalakim >= AM3_11_20) ||
(lastWasLeapYear && dow == MON && moladHalakim >= AM9_32_43))
{
tishri1++;
dow++;
if (dow == 7)
dow = 0;
}
// Apply rule 1 after the others because it can cause an additional delay of one day.
if (dow == WED || dow == FRI || dow == SUN) {
tishri1++;
}
return tishri1;
}
// end hiding contents from old browsers -->
</script>
</head>
<BODY>
<p>
You may place whatever text you want before the date here.
<p>
This is the date:
<p>
<!--Show the date now-->
<script LANGUAGE="JavaScript">
<!-- to hide script contents from old browsers
document.writeln("<font size=-1> <CENTER>");
displayGregorianDate();
document.writeln(" ");
displayWeekday();
document.writeln(" ");
SdnToHebrew(GregorianToSdn(today.getYear(),today.getMonth()+1,today.getDate()));
displayHebrewDate();
document.writeln("</CENTER></font>");
// end hiding contents from old browsers -->
</script>
<p>
You may place whatever text you want after the date here.
<p>
</BODY>
</HTML>
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