var LunarCalendar = function(now) {

	var lunarInfo=new Array(
		0x04bd8,0x04ae0,0x0a570,0x054d5,0x0d260,0x0d950,0x16554,0x056a0,0x09ad0,0x055d2,
		0x04ae0,0x0a5b6,0x0a4d0,0x0d250,0x1d255,0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,
		0x04970,0x0a4b0,0x0b4b5,0x06a50,0x06d40,0x1ab54,0x02b60,0x09570,0x052f2,0x04970,
		0x06566,0x0d4a0,0x0ea50,0x06e95,0x05ad0,0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,
		0x0d4a0,0x1d8a6,0x0b550,0x056a0,0x1a5b4,0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,
		0x06ca0,0x0b550,0x15355,0x04da0,0x0a5d0,0x14573,0x052d0,0x0a9a8,0x0e950,0x06aa0,
		0x0aea6,0x0ab50,0x04b60,0x0aae4,0x0a570,0x05260,0x0f263,0x0d950,0x05b57,0x056a0,
		0x096d0,0x04dd5,0x04ad0,0x0a4d0,0x0d4d4,0x0d250,0x0d558,0x0b540,0x0b5a0,0x195a6,
		0x095b0,0x049b0,0x0a974,0x0a4b0,0x0b27a,0x06a50,0x06d40,0x0af46,0x0ab60,0x09570,
		0x04af5,0x04970,0x064b0,0x074a3,0x0ea50,0x06b58,0x055c0,0x0ab60,0x096d5,0x092e0,
		0x0c960,0x0d954,0x0d4a0,0x0da50,0x07552,0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,
		0x0a950,0x0b4a0,0x0baa4,0x0ad50,0x055d9,0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,
		0x07954,0x06aa0,0x0ad50,0x05b52,0x04b60,0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,
		0x05aa0,0x076a3,0x096d0,0x04bd7,0x04ad0,0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,
		0x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577,0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0
	);
	var animals=new Array("鼠","牛","虎","兔","龙","蛇","马","羊","猴","鸡","狗","猪");
	var gan=new Array("甲","乙","丙","丁","戊","己","庚","辛","壬","癸");
	var zhi=new Array("子","丑","寅","卯","辰","巳","午","未","申","酉","戌","亥");
	var chineseWeekday = new Array("星期日","星期一","星期二","星期三","星期四","星期五","星期六");
	
	//==== 传入 offset 传回干支, 0=甲子
	function cyclical(num) {
		return(gan[num%10]+zhi[num%12]);
	}

	//==== 传回农历 y年的总天数
	function lYearDays(y) {
		var i, sum = 348;
		for(i=0x8000; i>0x8; i>>=1) {
			sum += (lunarInfo[y-1900] & i)? 1: 0;
		}
		return(sum+leapDays(y));
	}
	
	//==== 传回农历 y年闰月的天数
	function leapDays(y) {
		if(leapMonth(y)) {
			return((lunarInfo[y-1900] & 0x10000)? 30: 29);
		}
		return(0)
	}
	
	//==== 传回农历 y年闰哪个月 1-12 , 没闰传回 0
	function leapMonth(y) {
		return(lunarInfo[y-1900] & 0xf)
	}
	
	//====================================== 传回农历 y年m月的总天数
	function monthDays(y,m) {
		return ((lunarInfo[y-1900] & (0x10000>>m))? 30: 29);
	}
	
	//==== 算出农历, 传入日期物件, 传回农历日期物件
	//     该物件属性有 .year .month .day .isLeap .yearCyl .dayCyl .monCyl
	function Lunar(objDate) {
		var i, leap=0, temp=0;
		var baseDate = new Date(1900,0,31);
		var offset = (objDate - baseDate)/86400000;
	
		this.dayCyl = offset + 40;
		this.monCyl = 14;
	
		for(i=1900; i<2050 && offset>0; i++) {
			temp = lYearDays(i);
			offset -= temp;
			this.monCyl += 12;
		}
		if(offset<0) {
			offset += temp;
			i--;
			this.monCyl -= 12;
		}
	
		this.year = i;
		this.yearCyl = i-1864;
		
		leap = leapMonth(i); //闰哪个月
		this.isLeap = false;
		
		for(i=1; i<13 && offset>0; i++) {
			//闰月
			if(leap>0 && i==(leap+1) && this.isLeap==false) {
				--i;
				this.isLeap = true;
				temp = leapDays(this.year);
			} else {
				temp = monthDays(this.year, i);
			}
			
			//解除闰月
			if(this.isLeap==true && i==(leap+1)) {
				this.isLeap = false;
			}
			
			offset -= temp;
			if(this.isLeap == false) {
				this.monCyl++;
			}	
		}
	
		if(offset==0 && leap>0 && i==leap+1) {
			if(this.isLeap) {
				this.isLeap = false;
			} else {
				this.isLeap = true;
				--i;
				--this.monCyl;
			}
		}
		if(offset<0){
			offset += temp;
			--i;
			--this.monCyl; 
		}
		
		this.month = i;
		this.day = offset + 1;
	}
	
	now = now || new Date();
	var SY = now.getFullYear(); 
	var SM = now.getMonth();
	var SD = now.getDate();
	var lunar = new Lunar(new Date(SY, SM, SD));
	
	return {
		//==== 公历年份
		getSolarYear: function() {
			return SY;
		},
		//==== 公历月份 0~11
		getSolarMonth: function() {
			return SM;
		},
		//==== 公历日期
		getSolarDate: function() {
			return SD;
		},
		//==== 星期 0~6
		getWeekday: function() {
			return now.getDay();
		},
		//==== 星期(中文)
		getChineseWeekday: function() { 
			return(chineseWeekday[this.getWeekday()]); 
		},
		//==== 完整的公历中文日期 YYYY年MM月D日 
		getChineseSolarFullDate: function() {
			return (SY + '年' + (SM + 1) + '月' + SD + '日'); 
		},
		//==== 生肖
		getAnimal: function() {
			return animals[(SY-4)%12];
		},
		//==== 农历月份1~12
		getLunarMonth: function() {
			return lunar.month;
		},
		//==== 农历日期
		getLunarDate: function() {
			return lunar.day;
		},
		//==== 农历月份(中文)
		getChineseLunarMonth: function() {
			var nStr1 = new Array('日','一','二','三','四','五','六','七','八','九','十');
			var m = lunar.month;
			if (m > 10) {
				return '十' + nStr1[m-10];
			} else {
				return nStr1[m]
			}
		},
		//==== 农历日期(中文)
		getChineseLunarDate: function() {
			var nStr1 = new Array('日','一','二','三','四','五','六','七','八','九','十');
			var nStr2 = new Array('初','十','廿','卅','　');
			var d = lunar.day;
			switch (d) {
				case 10:
					return '初十';
				case 20:
					return '二十';
				case 30:
					return '三十';
			}
			return nStr2[Math.floor(d/10)] + nStr1[d%10];
		},
		//==== 农历年份(天干地支)
		getLunarYearCyclical: function() {
			return cyclical(SY-1900+36);
		},
		//==== 农历月份(天干地支)
		getLunarMonthCyclical: function() {
			return cyclical(lunar.monCyl);
		},
		//==== 农历日期(天干地支)
		getLunarDateCyclical: function() {
			return cyclical(lunar.dayCyl);
		},
		//==== 节气
		getSolarTerm: function() {
			var sTermInfo = new Array(0,21208,42467,63836,85337,107014,128867,150921,173149,195551,218072,240693,263343,285989,308563,331033,353350,375494,397447,419210,440795,462224,483532,504758);
			var solarTerm = new Array("小寒","大寒","立春","雨水","惊蛰","春分","清明","谷雨","立夏","小满","芒种","夏至","小暑","大暑","立秋","处暑","白露","秋分","寒露","霜降","立冬","小雪","大雪","冬至");
			var tmp1 = new Date((31556925974.7*(SY-1900)+sTermInfo[SM*2+1]*60000)+Date.UTC(1900,0,6,2,5));
			var tmp2 = tmp1.getUTCDate();
			if (tmp2==SD) {
				return solarTerm[SM*2+1];
			}
			tmp1 = new Date((31556925974.7*(SY-1900)+sTermInfo[SM*2]*60000)+Date.UTC(1900,0,6,2,5));
			tmp2= tmp1.getUTCDate();
			if (tmp2==SD) {
				return solarTerm[SM*2];
			}
			return '';
		},
		//==== 农历节日
		getLunarFestival: function() {
			var lFtv = new Array("0101*春节","0115 元宵节","0505 端午节","0707 七夕节","0715 中元节","0815 中秋节","0909 重阳节","1208 腊八节","1224 小年","0100*除夕");
			for(var i in lFtv) {
				if(lFtv[i].match(/^(\d{2})(.{2})([\s\*])(.+)$/)) {
					var tmp1=Number(RegExp.$1)-lunar.month;
					var tmp2=Number(RegExp.$2)-lunar.day;
					if(tmp1==0 && tmp2==0) {
						return RegExp.$4;
					}
				}
			}
			return ''
		}
	}
}