// Copyright (c) 2004-2006 koikikukan All Rights Reserved.
// http://www.koikikukan.com/
// License is granted if and only if this entire
// copyright notice is included. By Yujiro ARAKI.

// Ver1.00en 2006.04.11 for England and Wales.
// Ver1.01en 2006.04.15 fix bug.
// Ver1.02en 2006.04.16 fix bug.
// Ver1.03en 2006.08.03 fix bug.

//以上のファイルをUS版に変更してみる。2007.02.21 BY GASPARD
// fix bug. 2008.05.23 BY GASPARD

var currentYear;
var currentMonth;
var currentDay;

function setCurrentDate() {
    data = new Date();
    currentYear = data.getYear();
    currentYear = (currentYear < 2000) ? currentYear + 1900 : currentYear;
    currentMonth = data.getMonth() + 1;
    currentDay = data.getDate();
}

function isToday(year, month, day) {
    if (year == currentYear && parseInt(month,10) == currentMonth && day == currentDay) {
        return true;
    }
    return false;
}

function isSaturday(year, month, day) {
    var week = new Date(year, month - 1, day).getDay();
    if (week == 6) {
        return true;
    }
    return false;
}

function isHoliday(year, month, day) {
    var week = new Date(year, month - 1, day).getDay();
    if (week == 0) {
        return true;
    }
    switch(parseInt(month,10)) {
    case 1:
	//1月1日 New Year's Day 振替休日あり。日曜日の場合1/2、土曜日の場合12/31が祝日となる（12月参照）。
        if (day == 1) {
            return true;
        }
        if (day == 2 && isSunday(year, month, 1)) {
            return true;
        }
	//1月第3月曜日 Birthday of Martin Luther King, Jr., or Martin Luther King Day	
		if (day ==(getFirstMonday(year, month) +14)) {
            return true;		
		}
	//1月20日　Inauguration Day. 4年に1度のみ。次期大統領選。振替休日なし。2005〜2021まで設定。	
		if ((year == 2005 || year == 2009 || year == 2013 || year == 2017 || year == 2021) && day ==20) {
            return true;
		}		
        break;
    case 2:
	//2月第3月曜日　Washington's Birthday
        if (day == (getFirstMonday(year, month) +14)) {
            return true;
        }
        break;
    case 5:
	//5月最終月曜日　Memorial Day
        if (day == (getFirstMonday(year, month) +21) && ((getFirstMonday(year, month) +28) > 31)) {
            return true;
        }
        if (day == (getFirstMonday(year, month) +28)) {
            return true;
        }
        break;
    case 7:
	//7月4日　Independence Day. usually called the Fourth of July. 振替休日あり。
        if (day == 3 && isSaturday(year, month, 4)) {
            return true;
        }
        if (day == 4) {
            return true;
        }
        if (day == 5 && isSunday(year, month, 4)) {
            return true;
        }
        break;
    case 9:
	//9月第1月曜日　Labor Day. 
        if (day == (getFirstMonday(year, month))) {
            return true;
        }
		break;
    case 10:
	//10月第2月曜日　Columbus Day.
        if (day == (getFirstMonday(year, month) +7)) {
            return true;
        }
		break;
	case 11:
	//11月11日　Veterans Day.
        if (day == 10 && isSaturday(year, month, 11)) {
            return true;
        }
		if (day == 11) {
			return true;
		}
		if (day == 12 && isSunday(year, month, 11)) {
			return true;
		}
	//11月第4木曜日　Thanksgiving Day.		
		if (day == (getFirstMonday(year, month) + 17) && 
		    ((getFirstMonday(year, month) + 24) > 28)) {
			return true;
		}
		if (day == (getFirstMonday(year, month) + 24) && 
		    ((getFirstMonday(year, month) + 17) < 22)) {
			return true;
		}
		break;		
    case 12:
	//12月25日　Christmas Day.
		if (day == 24 && isSaturday(year, month, 25)) {
			return true;
		}	
        if (day == 25) {
            return true;
        }
        if (day == 26 && isSunday(year, month, 25)) {
            return true;
        }
	//12月31日　翌日の元旦が土曜日の場合のみ。	
        if (day == 31 && isSaturday(year+1, month+1, 1)) {
            return true;
        }
        break;
    }
    return false;
}

function isSunday(year, month, day) {
    var week = new Date(year, month - 1, day).getDay();
    if (week == 0) {
        return true;
    }
    return false;
}

function getFirstMonday(year, month) {
    var monday;
    for(monday = 1; monday < 8; monday++) {
        if(new Date(year, month - 1, monday).getDay() == 1) {
            break;
        }
    }
    return monday;
}