/* en_kdate.js based on kdate.js of kaluach
 *
 * kdate.js - Kaluach Javascript Hebrew date routines
 *   Version 1.00
 * Copyright (C) 5760,5761 (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: abumami@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(
	'Nisan', 'Iyyar', 'Sivan', 'Tammuz', 'Av', 'Elul',
	'Tishrei', 'Cheshvan', 'Kislev', 'Tevet', 'Shevat',
	'Adar', 'Adar I', 'Adar II');

var hHebDay = new makeArray('1', '2', '3', '4', '5', '6', '7', '8', '9', '10',
		'11', '12', '13', '14', '15', '16', '17', '18', '19', '20',
		'21', '22', '23', '24', '25', '26', '27', '28', '29', '30');

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 hHebYear(year){
	return(year);
}

function getCivDate(){
	var now = new Date;
	var tday = now.getDate();
	var tmonth = now.getMonth() + 1;
	var tyear = now.getYear();
	if(tyear < 1900)
		tyear += 1900;
	return(tday + "." + tmonth + "." + tyear);
}

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 "";
}

function get2HD(dd, mm, yy){
	var hebDate = civ2heb(dd, mm, yy);
	var hmS = hebDate.substring(hebDate.indexOf(' ')+1, hebDate.length);
	var hDay = eval(hebDate.substring(0, hebDate.indexOf(' ')));
	var hMonth = eval(hmS.substring(0, hmS.indexOf(' ')));
	var hYear = hmS.substring(hmS.indexOf(' ')+1, hmS.length);
	return(hDay + ' ' + hebMonth[hMonth+1] + ' ' + hYear);
}

function get2CD(dd, mm, yy){
	return(dd + "." + mm + "." + yy);
}

function getHebDate(){
	var now = new Date;
	var tday = now.getDate();
	var tmonth = now.getMonth() + 1;
	var tyear = now.getYear();
	if(tyear < 1900)
		// if date from Netscape, then add 1900
		tyear += 1900;
	var hebDate = civ2heb(tday, tmonth, tyear);
	var hmS = hebDate.substring(hebDate.indexOf(' ')+1, hebDate.length);
	var hDay = eval(hebDate.substring(0, hebDate.indexOf(' ')));
	var hMonth = eval(hmS.substring(0, hmS.indexOf(' ')));
	var hYear = hmS.substring(hmS.indexOf(' ')+1, hmS.length);
	return(hDay + ' ' + hebMonth[hMonth+1] + ' ' + hYear);
}