Javascript conversion between lunar calendar and Gregorian calendar

/**用法
 * Lunar.toSolar(2016, 6, 3); 农历转化公历
 * Lunar.toLunar(2016, 7, 6); 公历转化农历
 */
var Lunar = {
    MIN_YEAR : 1891,
    MAX_YEAR : 2100,
    lunarInfo : [
        [0,2,9, 21936], [6,1,30, 9656], [0,2,17, 9584], [0,2,6, 21168], [5,1,26,43344], [0,2,13,59728],
        [0,2,2, 27296], [3,1,22,44368], [0,2,10,43856], [8,1,30,19304], [0,2,19,19168], [0,2,8, 42352],
        [5,1,29,21096], [0,2,16,53856], [0,2,4, 55632], [4,1,25,27304], [0,2,13,22176], [0,2,2, 39632],
        [2,1,22,19176], [0,2,10,19168], [6,1,30,42200], [0,2,18,42192], [0,2,6, 53840], [5,1,26,54568],
        [0,2,14,46400], [0,2,3, 54944], [2,1,23,38608], [0,2,11,38320], [7,2,1, 18872], [0,2,20,18800],
        [0,2,8, 42160], [5,1,28,45656], [0,2,16,27216], [0,2,5, 27968], [4,1,24,44456], [0,2,13,11104],
        [0,2,2, 38256], [2,1,23,18808], [0,2,10,18800], [6,1,30,25776], [0,2,17,54432], [0,2,6, 59984],
        [5,1,26,27976], [0,2,14,23248], [0,2,4, 11104], [3,1,24,37744], [0,2,11,37600], [7,1,31,51560],
        [0,2,19,51536], [0,2,8, 54432], [6,1,27,55888], [0,2,15,46416], [0,2,5, 22176], [4,1,25,43736],
        [0,2,13, 9680], [0,2,2, 37584], [2,1,22,51544], [0,2,10,43344], [7,1,29,46248], [0,2,17,27808],
        [0,2,6, 46416], [5,1,27,21928], [0,2,14,19872], [0,2,3, 42416], [3,1,24,21176], [0,2,12,21168],
        [8,1,31,43344], [0,2,18,59728], [0,2,8, 27296], [6,1,28,44368], [0,2,15,43856], [0,2,5, 19296],
        [4,1,25,42352], [0,2,13,42352], [0,2,2, 21088], [3,1,21,59696], [0,2,9, 55632], [7,1,30,23208],
        [0,2,17,22176], [0,2,6, 38608], [5,1,27,19176], [0,2,15,19152], [0,2,3, 42192], [4,1,23,53864],
        [0,2,11,53840], [8,1,31,54568], [0,2,18,46400], [0,2,7, 46752], [6,1,28,38608], [0,2,16,38320],
        [0,2,5, 18864], [4,1,25,42168], [0,2,13,42160], [10,2,2,45656], [0,2,20,27216], [0,2,9, 27968],
        [6,1,29,44448], [0,2,17,43872], [0,2,6, 38256], [5,1,27,18808], [0,2,15,18800], [0,2,4, 25776],
        [3,1,23,27216], [0,2,10,59984], [8,1,31,27432], [0,2,19,23232], [0,2,7, 43872], [5,1,28,37736],
        [0,2,16,37600], [0,2,5, 51552], [4,1,24,54440], [0,2,12,54432], [0,2,1, 55888], [2,1,22,23208],
        [0,2,9, 22176], [7,1,29,43736], [0,2,18, 9680], [0,2,7, 37584], [5,1,26,51544], [0,2,14,43344],
        [0,2,3, 46240], [4,1,23,46416], [0,2,10,44368], [9,1,31,21928], [0,2,19,19360], [0,2,8, 42416],
        [6,1,28,21176], [0,2,16,21168], [0,2,5, 43312], [4,1,25,29864], [0,2,12,27296], [0,2,1, 44368],
        [2,1,22,19880], [0,2,10,19296], [6,1,29,42352], [0,2,17,42208], [0,2,6, 53856], [5,1,26,59696],
        [0,2,13,54576], [0,2,3, 23200], [3,1,23,27472], [0,2,11,38608], [11,1,31,19176],[0,2,19,19152],
        [0,2,8, 42192], [6,1,28,53848], [0,2,15,53840], [0,2,4, 54560], [5,1,24,55968], [0,2,12,46496],
        [0,2,1, 22224], [2,1,22,19160], [0,2,10,18864], [7,1,30,42168], [0,2,17,42160], [0,2,6, 43600],
        [5,1,26,46376], [0,2,14,27936], [0,2,2, 44448], [3,1,23,21936], [0,2,11,37744], [8,2,1, 18808],
        [0,2,19,18800], [0,2,8, 25776], [6,1,28,27216], [0,2,15,59984], [0,2,4, 27424], [4,1,24,43872],
        [0,2,12,43744], [0,2,2, 37600], [3,1,21,51568], [0,2,9, 51552], [7,1,29,54440], [0,2,17,54432],
        [0,2,5, 55888], [5,1,26,23208], [0,2,14,22176], [0,2,3, 42704], [4,1,23,21224], [0,2,11,21200],
        [8,1,31,43352], [0,2,19,43344], [0,2,7, 46240], [6,1,27,46416], [0,2,15,44368], [0,2,5, 21920],
        [4,1,24,42448], [0,2,12,42416], [0,2,2, 21168], [3,1,22,43320], [0,2,9, 26928], [7,1,29,29336],
        [0,2,17,27296], [0,2,6, 44368], [5,1,26,19880], [0,2,14,19296], [0,2,3, 42352], [4,1,24,21104],
        [0,2,10,53856], [8,1,30,59696], [0,2,18,54560], [0,2,7, 55968], [6,1,27,27472], [0,2,15,22224],
        [0,2,5, 19168], [4,1,25,42216], [0,2,12,42192], [0,2,1, 53584], [2,1,21,55592], [0,2,9, 54560]
    ],
    //是否闰年
    isLeapYear : function(year) {
        return ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0));
    },
    //天干地支年
    lunarYear : function(year) {
        var gan = ['庚', '辛', '壬', '癸', '甲', '乙', '丙', '丁', '戊', '己'],
            zhi = ['申', '酉', '戌', '亥', '子', '丑', '寅', '卯', '辰', '巳', '午', '未'],
            str = year.toString().split("");
        return gan[str[3]] + zhi[year % 12];
    },
    //生肖年
    zodiacYear : function(year) {
        var zodiac = ['猴', '鸡', '狗', '猪', '鼠', '牛', '虎', '兔', '龙', '蛇', '马', '羊'];
        return zodiac[year % 12];
    },
    //公历月份天数
    //@param year 阳历-年
    //@param month 阳历-月
    solarMonthDays : function(year, month) {
        var FebDays = this.isLeapYear(year) ? 29 : 28;
        var monthHash = ['', 31, FebDays, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
        return monthHash[month];
    },
    //农历月份天数
    lunarMonthDays : function(year, month) {
        var monthData = this.lunarMonths(year);
        return monthData[month - 1];
    },
    //农历月份天数数组
    lunarMonths : function(year) {
        var yearData = this.lunarInfo[year - this.MIN_YEAR];
        var leapMonth = yearData[0];
        var bit = (+yearData[3]).toString(2);
        var months = [];
        for (var i = 0; i < bit.length; i++) {
            months[i] = bit.substr(i, 1);
        }
     
        for (var k = 0, len = 16 - months.length; k < len; k++) {
            months.unshift(&#39;0&#39;);
        }
     
        months = months.slice(0, (leapMonth == 0 ? 12 : 13));
        for (var i = 0; i < months.length; i++) {
            months[i] = +months[i] + 29;
        }
        return months;
    },
    //农历每年的天数
    //@param year 农历年份
    lunarYearDays : function(year) {
        var monthArray = this.lunarYearMonths(year);
        var len = monthArray.length;
        return (monthArray[len-1] == 0 ? monthArray[len-2] : monthArray[len-1]);
    },
    //
    lunarYearMonths : function(year) {
        var monthData = this.lunarMonths(year);
        var res = [];
        var temp = 0;
        var yearData = this.lunarInfo[year - this.MIN_YEAR];
        var len = (yearData[0] == 0 ? 12 : 13);
        for (var i = 0; i < len; i++) {
            temp = 0;
            for (j = 0; j <= i; j++) {
                temp += monthData[j];
            }
            res.push(temp);
        }
        return res;
    },
    //获取闰月
    //@param year 农历年份
    leapMonth : function(year){
        var yearData = this.lunarInfo[year - this.MIN_YEAR];
        return yearData[0];
    },
    //计算农历日期与正月初一相隔的天数
    betweenLunarDays : function(year, month, day) {
        var yearMonth = this.lunarMonths(year);
        var res = 0;
        for (var i = 1; i < month; i++) {
            res += yearMonth[i-1];
        }
        res += day - 1;
        return res;
    },
    //计算2个阳历日期之间的天数
    //@param year 阳历年
    //@param month
    //@param day
    //@param l_month 阴历正月对应的阳历月份
    //@param l_day   阴历初一对应的阳历天
    betweenSolarDays : function(year, month, day, l_month, l_day) {
        var time1 = new Date(year +"-"+  month  +"-"+ day).getTime(),
            time2 = new Date(year +"-"+ l_month +"-"+ l_day).getTime();
        return Math.ceil((time1-time2)/24/3600/1000);
    },
    //根据距离正月初一的天数计算阴历日期
    //@param year 阳历年
    //@param between 天数
    lunarByBetween : function(year, between) {
        var lunarArray = [], yearMonth = [], t = 0, e = 0, leapMonth = 0, m = &#39;&#39;;
        if (between == 0) {
            t = 1;
            e = 1;
            m = &#39;正月&#39;;
        } else {
            year = between > 0 ? year : (year - 1);
            yearMonth = this.lunarYearMonths(year);
            leapMonth = this.leapMonth(year);
            between   = between > 0 ? between : (this.lunarYearDays(year) + between);
            for (var i = 0; i < 13; i++) {
                if (between == yearMonth[i]) {
                    t = i + 2;
                    e = 1;
                    break;
                } else if (between < yearMonth[i]) {
                    t = i + 1;
                    e = between - ((yearMonth[i-1]) ? yearMonth[i-1] : 0) + 1;
                    break;
                }
            }
             
            m = (leapMonth != 0 && t == leapMonth + 1)
            ? (&#39;闰&#39;. this.chineseMonth(t-1))
            : this.chineseMonth(((leapMonth != 0 && leapMonth + 1 < t) ? (t - 1) : t));
        }
        lunarArray.push(year, t, e); //年 月 日
        lunarArray.push(this.lunarYear(year),
                        this.zodiacYear(year),
                        m,
                        this.chineseNumber(e)); //天干地支年 生肖年 月份 日
        lunarArray.push(leapMonth); //闰几月
        return lunarArray;
    },
    //中文月份
    chineseMonth : function(month) {
        var monthHash = [&#39;&#39;, &#39;正月&#39;, &#39;二月&#39;, &#39;三月&#39;, &#39;四月&#39;, &#39;五月&#39;, &#39;六月&#39;, &#39;七月&#39;, &#39;八月&#39;, &#39;九月&#39;, &#39;十月&#39;, &#39;冬月&#39;, &#39;腊月&#39;];
        return monthHash[month];
    },
    //中文日期
    chineseNumber : function(num) {
        var dateHash = [&#39;&#39;, &#39;一&#39;, &#39;二&#39;, &#39;三&#39;, &#39;四&#39;, &#39;五&#39;, &#39;六&#39;, &#39;七&#39;, &#39;八&#39;, &#39;九&#39;, &#39;十&#39;];
        if (num <= 10) {
            res = &#39;初&#39;+ dateHash[num];
        } else if (num > 10 && num < 20) {
            res = &#39;十&#39;+ dateHash[num-10];
        } else if (num == 20) {
            res = "二十";
        } else if (num > 20 && num < 30) {
            res = "廿"+ dateHash[num-20];
        } else if (num == 30) {
            res = "三十";
        }
        return res;
    },
    //转换农历
    toLunar : function(year, month, day) {
        var yearData = this.lunarInfo[year - this.MIN_YEAR];
        if (year == this.MIN_YEAR && month <= 2 && day <= 9) {
            return [1891, 1, 1, &#39;辛卯&#39;, &#39;兔&#39;, &#39;正月&#39;, &#39;初一&#39;];
        }
        return this.lunarByBetween(year, this.betweenSolarDays(year, month, day, yearData[1], yearData[2]));
    },
    //转换公历
    //@param year  阴历-年
    //@param month 阴历-月，闰月处理：例如如果当年闰五月，那么第二个五月就传六月，相当于阴历有13个月
    //@param date  阴历-日
    toSolar : function(year, month, day) {
        var yearData = this.lunarInfo[year - this.MIN_YEAR];
        var between  = this.betweenLunarDays(year, month, day);
        var ms = new Date(year +"-" + yearData[1] +"-"+ yearData[2]).getTime();
        var s = ms + between * 24 * 60 * 60 * 1000;
        var d = new Date();
        d.setTime(s);
        year  = d.getFullYear();
        month = d.getMonth() + 1;
        day   = d.getDate();
        return [year, month, day];
    }
};