lunar.js

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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 nStr1 = new Array('日','一','二','三','四','五','六','七','八','九','十');
var nStr2 = new Array('初','十','廿','卅','　');
var solarMonth=new Array(31,28,31,30,31,30,31,31,30,31,30,31);

//====================================== 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);
	}else{
		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;
}

//==============================传回国历 y年某m+1月的天数
function solarDays(y,m) {
	if(m==1){
		return(((y%4 == 0) && (y%100 != 0) || (y%400 == 0))? 29: 28)
	}else{
		return(solarMonth[m]);
	}
}

function calendar(y,m) {
	var sDObj, lDObj, lY, lM, lD=1, lL, lX=0;

	sDObj = new Date(y,m,1); //当月一日日期

	this.length = solarDays(y,m); //国历当月天数
	for(var i=0;i<this.length;i++) {
		if(lD>lX) {
			sDObj = new Date(y,m,i+1) //当月一日日期
			lDObj = new Lunar(sDObj) //农历
			lY = lDObj.year //农历年
			lM = lDObj.month //农历月
			lD = lDObj.day //农历日
			lL = lDObj.isLeap //农历是否闰月
			lX = lL? leapDays(lY): monthDays(lY,lM) //农历当月最後一天
		}

		this[i] = [lY, lM, lD++, lL];
	}
}
function cDay(d){
	var s;
	if(d[2]==1){
		s = (d[3]?'闰':'') + d[1] + '月' + (monthDays(d[0],d[1])==29?'小':'大');
	}else{
		switch (d[2]) {
			case 10:
				s = '初十';
				break;
			case 20:
				s = '二十';
				break;
			case 30:
				s = '三十';
				break;
			default :
			s = nStr2[Math.floor(d[2]/10)];
			s += nStr1[d[2]%10];
		}
	}
	return(s);
}