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/* kdate.js - Kaluach Javascript Hebrew date routines

 *   Version 0.03 (beta release)

 * Copyright (C) 5760 (2000 CE), by Abu Mami and Yisrael Hersch.

 *   All Rights Reserved.

 *   All copyright notices in this script must be left intact.

 * Based on the formula by Gauss

 * Terms of use:

 *   - Permission will be granted to use this script on personal

 *     web pages. All that's required is that you please ask.

 *     (Of course if you want to send a few dollars, that's OK too :-)

 *   - Use on commercial web sites requires a $50 payment.

 * website: http://www.kaluach.net

 * email: abu-mami@kaluach.net

 */



function makeArray() {

	this[0] = makeArray.arguments.length;

	for (i = 0; i < makeArray.arguments.length; i = i + 1)

		this[i+1] = makeArray.arguments[i];

}



var hebMonth = new makeArray(

	'àÙáß', 'ÐÙÙè', 'áÙÕß', 'êÞÕÖ', 'ÐÑ', 'ÐÜÕÜ',

	'êéèÙ', '×éÕß', 'ÛáÜÕ', 'ØÑê', 'éÑØ',

	'ÐÓè', 'ÐÓè Ð', 'ÐÓè Ñ');



var civMonth = new makeArray(

	'January', 'February', 'March', 'April', 'May', 'June',

	'July', 'August', 'September', 'October', 'November', 'December');



var weekDay = new makeArray(

	'Sun', 'Mon', 'Tues', 'Wed', 'Thur', 'Fri', 'Shabbat');



function Gauss(year) {

	var a,b,c;

	var m;

	var	Mar;	// "day in March" on which Pesach falls (return value)



	a = Math.floor((12 * year + 17) % 19);

	b = Math.floor(year % 4);

	m = 32.044093161144 + 1.5542417966212 * a +  b / 4.0 - 0.0031777940220923 * year;

	if (m < 0)

		m -= 1;

	Mar = Math.floor(m);

	if (m < 0)

		m++;

	m -= Mar;



	c = Math.floor((Mar + 3 * year + 5 * b + 5) % 7);

	if(c == 0 && a > 11 && m >= 0.89772376543210 )

		Mar++;

	else if(c == 1 && a > 6 && m >= 0.63287037037037)

		Mar += 2;

	else if(c == 2 || c == 4 || c == 6)

		Mar++;



	Mar += Math.floor((year - 3760) / 100) - Math.floor((year - 3760) / 400) - 2;

	return Mar;

}



function leap(y) {

	return ((y % 400 == 0) || (y % 100 != 0 && y % 4 == 0));

}



function civMonthLength(month, year) {

	if(month == 2)

		return 28 + leap(year);

	else if(month == 4 || month == 6 || month == 9 || month == 11)

	   return 30;

	else

		return 31;

}



function civ2heb(day, month, year) {

	var d = day;

	var	m = month;

	var y = year;

	var hy;

	var pesach;

	var anchor;

	var adarType;



	m -= 2;

	if (m <= 0) { // Jan or Feb

		m += 12;

		y -= 1;

	}



	d += Math.floor(7 * m / 12 + 30 * (m - 1)); // day in March

	hy = y + 3760;	// get Hebrew year

	pesach = Gauss(hy);

	if (d <= pesach - 15) { // before 1 Nisan

		anchor = pesach;

		d += 365;

		if(leap(y))

			d++;

		y -= 1;

		hy -= 1;

		pesach = Gauss(hy);

	}

	else

		anchor = Gauss(hy + 1);



	d -= pesach - 15;

	anchor -= pesach - 12;

	y++;

	if(leap(y))

		anchor++;



	for(m = 0; m < 11; m++) {

		var days;

		if(m == 7 && anchor % 30 == 2)

			days = 30; // Cheshvan

		else if(m == 8 && anchor % 30 == 0)

			days = 29; // Kislev

		else

			days = 30 - m % 2;

		if(d <= days)

			break;

		d -= days;

	}



	adarType = 0;			// plain old Adar

	if (m == 11 && anchor >= 30) {

		if (d > 30) {

			adarType = 2;	// Adar 2

			d -= 30;

		}

		else

			adarType = 1;	// Adar 1

	}



	if(m >= 6)		// Tishrei or after?

		hy++;		// then bump up year



	if(m == 11)			// Adar?

		m += adarType;	// adjust for Adars



	return (d + ' ' + m + ' ' + hy);

}





function Easter(Y) {

	// based on the algorithm of Oudin

    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);



	var ret = new Object();

	ret[1] = M;

	ret[2] = D;

	return ret;

}



function DOW(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 NthDOW(nth,weekday,month,year) {

	if (nth > 0)

		return (nth - 1) * 7 + 1 + (7 + weekday - DOW((nth - 1) * 7 + 1, month, year)) % 7;

	var days = civMonthLength(month, year);

	return days - (DOW(days, month, year) - weekday + 7) % 7;

}



function holidays(cday, cmonth, cyear) {

	// American civil holidays and some major religious holiday

	if (cmonth == 1 && cday == 1)

		return "New Year's Day";

	else if (cmonth == 2 && cday == 12)

		return "Lincoln's Birthday";

	else if (cmonth == 2 && cday == 14)

		return "Valentine's Day";

	else if (cmonth == 2 && cday == NthDOW(3, 2, 2, cyear))

		return "President's Day";

	else if (cmonth == 3 && cday == 17)

		return "St. Patrick's Day";

	else if (cmonth == 3 || cmonth == 4) {

		var e = Easter(cyear);

	    if (cmonth == e[1] && cday == e[2])

			return "Easter";

	}

	else if (cmonth == 5 && cday == NthDOW(2, 1, 5, cyear))

		return "Mother's Day";

	else if (cmonth == 5 && cday == NthDOW(3, 7, 5, cyear))

		return "Armed Forces Day";

	else if (cmonth == 5 && cday == NthDOW(0, 2, 5, cyear))

		return "Memorial Day";

	else if (cmonth == 6 && cday == 14)

		return "Flag Day";

	else if (cmonth == 6 && cday == NthDOW(3, 1, 6, cyear))

		return "Father's Day";

	else if (cmonth == 7 && cday == 4)

		return "Independence Day";

	else if (cmonth == 9 && cday == NthDOW(1, 2, 9, cyear))

		return "Labor Day";

	else if (cmonth == 10 && cday == NthDOW(2, 2, 10, cyear))

		return "Columbus Day";

	else if (cmonth == 10 && cday == 31)

		return "Halloween";

	else if (cmonth == 11 && cday == 11)

		return "Veterans' Day";

	else if (cmonth == 11 && cday == NthDOW(4, 5, 11, cyear))

		return "Thanksgiving";

	else if (cmonth == 12 && cday == 25)

		return "Christmas";



	return "";

}



function moadim(cday, cmonth, cyear, hday, hmonth, dow) {

	if(hmonth == 6) {

		if(hday == 1 || hday == 2)

			return "Rosh Hashana"

		else if(hday == 3 && dow != 7)

			return "Fast of Gedalia";

		else if(hday == 4 && dow == 1)

			return "Fast of Gedalia";

		else if(hday == 10)

			return "Yom Kippur"

		else if(hday >= 15 && hday <= 22)

			return "Sukkot"

		else if(hday == 23)

			return "Sukkot (d)"

	}

	else if(hmonth == 8) {

		if(hday >= 25)

			return "Chanukkah"

	}

	else if(hmonth == 9) {

		if(hday <= 2) {

			return "Chanukkah"

		}

		else if(hday == 3) {

			// Kislev can be malei or chaser

			if(cday == 1) {

				cday = 29;

				cmonth = 11;

			}

			else if(cday == 2) {

				cday = 30;

				cmonth = 11;

			}

			else

				cday -= 3;

			var hdate = civ2heb(cday, cmonth, cyear);

			hd = eval(hdate.substring(0, hdate.indexOf(' ')));

			if(hd == 29)

				return "Chanukkah"

		}

		else if(hday == 10)

			return "Fast of Tevet"

	}

	else if(hmonth == 10) {

		if(hday==15)

			return "Tu b'Shvat"

	}

	else if(hmonth == 11 || hmonth == 13) {

		if(hday == 11 && dow == 5)

			return "Taanit Esther"

		else if(hday == 13 && dow != 7)

			return "Taanit Esther"

		else if(hday == 14)

			return "Purim"

		else if(hday == 15)

			return "Shushan Purim"

	}

	else if(hmonth == 0) {



		if(hday == 12 && dow == 5)

			return "Taanit Bechorot"

		else if(hday == 14 && dow != 7)

			return "Taanit Bechorot"

		else if(hday >= 15 && hday <= 21)

			return "Pesach"

		else if(hday == 22)

			return "Pesach (d)"

	}

	else if(hmonth == 1) {

		if(hday == 3 && dow == 5)

			return "Yom Ha'Atzmaut"

		else if(hday == 4 && dow == 5)

			return "Yom Ha'Atzmaut"

		else if(hday == 5 && dow != 6 && dow != 7)

			return "Yom Ha'Atzmaut"

		if(hday == 14)

			return "Pesah sheni"

		else if(hday == 18)

			return "Lag B'Omer"

		if(hday == 28)

			return "Yom Yerushalayim"

	}

	else if(hmonth == 2) {

		if(hday == 6)

			return "Shavuot"

		else if(hday == 7)

			return "Shavuot (d)"

	}

	else if(hmonth == 3) {

		if(hday == 17 && dow != 7)

			return "Fast of Tammuz"

		if(hday == 18 && dow == 1)

			return "Fast of Tammuz"

	}

	else if(hmonth == 4) {

		if(hday == 9 && dow != 7)

			return "Tisha B'Av"

		if(hday == 10 && dow == 1)

			return "Tisha B'Av"

		if(hday == 15)

			return "Tu B'Av"

	}



	return "";

}