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<script language="JavaScript">
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,
afterSundown = false,
hebrewMonth = 0,
hebrewDate = 0,
hebrewYear = 0,
metonicCycle = 0,
metonicYear = 0,
moladDay = 0,
moladHalakim = 0;
var gMonth = new gregmontharr("gennaio","febbraio","marzo","aprile","maggio","giugno","luglio","agosto","settembre","ottobre","novembre","dicembre");
var hMonth = new hebrewmontharr("Tishri","Heshvan","Kislev","Tevet","Shevat","Adar","AdarII","Nisan","Iyar","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();
afterSundown = (today.getHours() >= 19);
}
}
function displayWeekday()
{
document.writeln(gWeekday[today.getDay()]);
}
function displayGregorianDate()
{
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;
// 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;
if(afterSundown) {
sdn++;
}
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>
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