最近在做一個黃曆的快應用（quickapp），需要涉及到公曆轉陰曆，效果如下：

快應用（https://www.quickapp.cn/）：

• 快應用是基於手機硬體平臺的新型應用形態；標準是由主流手機廠商組成的快應用聯盟聯合制定；

• 快應用標準的誕生將在研發介面、能力接入、開發者服務等層面建設標準平臺；以平臺化的生態模式對個人開發者和企業開發者全品類開放。

• 快應用具備傳統APP完整的應用體驗，無需安裝，即點即用。

對於陰陽曆的轉換，分享一位牛人的做法：

/**
* @1900-2100區間內的公曆、農曆互轉
* @charset UTF-8
* @Author  Jea楊(
 
[email protected]) 
* @Time    2014-7-21
* @Time    2016-8-13 Fixed 2033hex、Attribution Annals
* @Time    2016-9-25 Fixed lunar LeapMonth Param Bug
* @Version 1.0.2
* @公曆轉農曆：calendar.solar2lunar(1987,11,01); //[you can ignore params of prefix 0]
* @農曆轉公曆：calendar.lunar2solar(1987,09,10); //[you can ignore params of prefix 0]
 
*/
var calendar = {
 
    /**
      * 農曆1900-2100的潤大小資訊表
      * @Array Of Property
      * @return Hex 
      */
    lunarInfo:[0x04bd8,0x04ae0,0x0a570,0x054d5,0x0d260,0x0d950,0x16554,0x056a0,0x09ad0,0x055d2,//1900-1909
            0x04ae0,0x0a5b6,0x0a4d0,0x0d250,0x1d255,0x0b540,0x0d6a0,0x0ada2,0x095b0,0x14977,//1910-1919
            0x04970,0x0a4b0,0x0b4b5,0x06a50,0x06d40,0x1ab54,0x02b60,0x09570,0x052f2,0x04970,//
 
1920-1929
            0x06566,0x0d4a0,0x0ea50,0x06e95,0x05ad0,0x02b60,0x186e3,0x092e0,0x1c8d7,0x0c950,//1930-1939
            0x0d4a0,0x1d8a6,0x0b550,0x056a0,0x1a5b4,0x025d0,0x092d0,0x0d2b2,0x0a950,0x0b557,//1940-1949
            0x06ca0,0x0b550,0x15355,0x04da0,0x0a5b0,0x14573,0x052b0,0x0a9a8,0x0e950,0x06aa0,//1950-1959
            0x0aea6,0x0ab50,0x04b60,0x0aae4,0x0a570,0x05260,0x0f263,0x0d950,0x05b57,0x056a0,//1960-1969
            0x096d0,0x04dd5,0x04ad0,0x0a4d0,0x0d4d4,0x0d250,0x0d558,0x0b540,0x0b6a0,0x195a6,//1970-1979
            0x095b0,0x049b0,0x0a974,0x0a4b0,0x0b27a,0x06a50,0x06d40,0x0af46,0x0ab60,0x09570,//1980-1989
            0x04af5,0x04970,0x064b0,0x074a3,0x0ea50,0x06b58,0x055c0,0x0ab60,0x096d5,0x092e0,//1990-1999
            0x0c960,0x0d954,0x0d4a0,0x0da50,0x07552,0x056a0,0x0abb7,0x025d0,0x092d0,0x0cab5,//2000-2009
            0x0a950,0x0b4a0,0x0baa4,0x0ad50,0x055d9,0x04ba0,0x0a5b0,0x15176,0x052b0,0x0a930,//2010-2019
            0x07954,0x06aa0,0x0ad50,0x05b52,0x04b60,0x0a6e6,0x0a4e0,0x0d260,0x0ea65,0x0d530,//2020-2029
            0x05aa0,0x076a3,0x096d0,0x04afb,0x04ad0,0x0a4d0,0x1d0b6,0x0d250,0x0d520,0x0dd45,//2030-2039
            0x0b5a0,0x056d0,0x055b2,0x049b0,0x0a577,0x0a4b0,0x0aa50,0x1b255,0x06d20,0x0ada0,//2040-2049
            /**Add By [email protected]**/
            0x14b63,0x09370,0x049f8,0x04970,0x064b0,0x168a6,0x0ea50, 0x06b20,0x1a6c4,0x0aae0,//2050-2059
            0x0a2e0,0x0d2e3,0x0c960,0x0d557,0x0d4a0,0x0da50,0x05d55,0x056a0,0x0a6d0,0x055d4,//2060-2069
            0x052d0,0x0a9b8,0x0a950,0x0b4a0,0x0b6a6,0x0ad50,0x055a0,0x0aba4,0x0a5b0,0x052b0,//2070-2079
            0x0b273,0x06930,0x07337,0x06aa0,0x0ad50,0x14b55,0x04b60,0x0a570,0x054e4,0x0d160,//2080-2089
            0x0e968,0x0d520,0x0daa0,0x16aa6,0x056d0,0x04ae0,0x0a9d4,0x0a2d0,0x0d150,0x0f252,//2090-2099
            0x0d520],//2100
 
    /**
      * 公曆每個月份的天數普通表
      * @Array Of Property
      * @return Number 
      */
    solarMonth:[31,28,31,30,31,30,31,31,30,31,30,31],
 
    /**
      * 天干地支之天干速查表
      * @Array Of Property trans["甲","乙","丙","丁","戊","己","庚","辛","壬","癸"]
      * @return Cn string 
      */
    Gan:["\u7532","\u4e59","\u4e19","\u4e01","\u620a","\u5df1","\u5e9a","\u8f9b","\u58ec","\u7678"],
 
    /**
      * 天干地支之地支速查表
      * @Array Of Property 
      * @trans["子","醜","寅","卯","辰","巳","午","未","申","酉","戌","亥"]
      * @return Cn string 
      */
    Zhi:["\u5b50","\u4e11","\u5bc5","\u536f","\u8fb0","\u5df3","\u5348","\u672a","\u7533","\u9149","\u620c","\u4ea5"],
 
    /**
      * 天干地支之地支速查表<=>生肖
      * @Array Of Property 
      * @trans["鼠","牛","虎","兔","龍","蛇","馬","羊","猴","雞","狗","豬"]
      * @return Cn string 
      */
    Animals:["\u9f20","\u725b","\u864e","\u5154","\u9f99","\u86c7","\u9a6c","\u7f8a","\u7334","\u9e21","\u72d7","\u732a"],
 
    /**
      * 24節氣速查表
      * @Array Of Property 
      * @trans["小寒","大寒","立春","雨水","驚蟄","春分","清明","穀雨","立夏","小滿","芒種","夏至","小暑","大暑","立秋","處暑","白露","秋分","寒露","霜降","立冬","小雪","大雪","冬至"]
      * @return Cn string 
      */
    solarTerm:["\u5c0f\u5bd2","\u5927\u5bd2","\u7acb\u6625","\u96e8\u6c34","\u60ca\u86f0","\u6625\u5206","\u6e05\u660e","\u8c37\u96e8","\u7acb\u590f","\u5c0f\u6ee1","\u8292\u79cd","\u590f\u81f3","\u5c0f\u6691","\u5927\u6691","\u7acb\u79cb","\u5904\u6691","\u767d\u9732","\u79cb\u5206","\u5bd2\u9732","\u971c\u964d","\u7acb\u51ac","\u5c0f\u96ea","\u5927\u96ea","\u51ac\u81f3"],
 
    /**
      * 1900-2100各年的24節氣日期速查表
      * @Array Of Property 
      * @return 0x string For splice
      */
    sTermInfo:['9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e','97bcf97c3598082c95f8c965cc920f',
              '97bd0b06bdb0722c965ce1cfcc920f','b027097bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf97c359801ec95f8c965cc920f','97bd0b06bdb0722c965ce1cfcc920f','b027097bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c965cc920e','97bcf97c359801ec95f8c965cc920f','97bd0b06bdb0722c965ce1cfcc920f',
              'b027097bd097c36b0b6fc9274c91aa','9778397bd19801ec9210c965cc920e','97b6b97bd19801ec95f8c965cc920f',
              '97bd09801d98082c95f8e1cfcc920f','97bd097bd097c36b0b6fc9210c8dc2','9778397bd197c36c9210c9274c91aa',
              '97b6b97bd19801ec95f8c965cc920e','97bd09801d98082c95f8e1cfcc920f','97bd097bd097c36b0b6fc9210c8dc2',
              '9778397bd097c36c9210c9274c91aa','97b6b97bd19801ec95f8c965cc920e','97bcf97c3598082c95f8e1cfcc920f',
              '97bd097bd097c36b0b6fc9210c8dc2','9778397bd097c36c9210c9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf97c3598082c95f8c965cc920f','97bd097bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c965cc920e','97bcf97c3598082c95f8c965cc920f','97bd097bd097c35b0b6fc920fb0722',
              '9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e','97bcf97c359801ec95f8c965cc920f',
              '97bd097bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf97c359801ec95f8c965cc920f','97bd097bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c965cc920e','97bcf97c359801ec95f8c965cc920f','97bd097bd07f595b0b6fc920fb0722',
              '9778397bd097c36b0b6fc9210c8dc2','9778397bd19801ec9210c9274c920e','97b6b97bd19801ec95f8c965cc920f',
              '97bd07f5307f595b0b0bc920fb0722','7f0e397bd097c36b0b6fc9210c8dc2','9778397bd097c36c9210c9274c920e',
              '97b6b97bd19801ec95f8c965cc920f','97bd07f5307f595b0b0bc920fb0722','7f0e397bd097c36b0b6fc9210c8dc2',
              '9778397bd097c36c9210c9274c91aa','97b6b97bd19801ec9210c965cc920e','97bd07f1487f595b0b0bc920fb0722',
              '7f0e397bd097c36b0b6fc9210c8dc2','9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf7f1487f595b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c965cc920e','97bcf7f1487f595b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722',
              '9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e','97bcf7f1487f531b0b0bb0b6fb0722',
              '7f0e397bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa','97b6b97bd19801ec9210c965cc920e',
              '97bcf7f1487f531b0b0bb0b6fb0722','7f0e397bd07f595b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b97bd19801ec9210c9274c920e','97bcf7f0e47f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722',
              '9778397bd097c36b0b6fc9210c91aa','97b6b97bd197c36c9210c9274c920e','97bcf7f0e47f531b0b0bb0b6fb0722',
              '7f0e397bd07f595b0b0bc920fb0722','9778397bd097c36b0b6fc9210c8dc2','9778397bd097c36c9210c9274c920e',
              '97b6b7f0e47f531b0723b0b6fb0722','7f0e37f5307f595b0b0bc920fb0722','7f0e397bd097c36b0b6fc9210c8dc2',
              '9778397bd097c36b0b70c9274c91aa','97b6b7f0e47f531b0723b0b6fb0721','7f0e37f1487f595b0b0bb0b6fb0722',
              '7f0e397bd097c35b0b6fc9210c8dc2','9778397bd097c36b0b6fc9274c91aa','97b6b7f0e47f531b0723b0b6fb0721',
              '7f0e27f1487f595b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722',
              '9778397bd097c36b0b6fc9274c91aa','97b6b7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722',
              '7f0e397bd097c35b0b6fc920fb0722','9778397bd097c36b0b6fc9274c91aa','97b6b7f0e47f531b0723b0b6fb0721',
              '7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722','9778397bd097c36b0b6fc9274c91aa',
              '97b6b7f0e47f531b0723b0787b0721','7f0e27f0e47f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722',
              '9778397bd097c36b0b6fc9210c91aa','97b6b7f0e47f149b0723b0787b0721','7f0e27f0e47f531b0723b0b6fb0722',
              '7f0e397bd07f595b0b0bc920fb0722','9778397bd097c36b0b6fc9210c8dc2','977837f0e37f149b0723b0787b0721',
              '7f07e7f0e47f531b0723b0b6fb0722','7f0e37f5307f595b0b0bc920fb0722','7f0e397bd097c35b0b6fc9210c8dc2',
              '977837f0e37f14998082b0787b0721','7f07e7f0e47f531b0723b0b6fb0721','7f0e37f1487f595b0b0bb0b6fb0722',
              '7f0e397bd097c35b0b6fc9210c8dc2','977837f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721',
              '7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722','977837f0e37f14998082b0787b06bd',
              '7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd097c35b0b6fc920fb0722',
              '977837f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722',
              '7f0e397bd07f595b0b0bc920fb0722','977837f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721',
              '7f0e27f1487f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722','977837f0e37f14998082b0787b06bd',
              '7f07e7f0e47f149b0723b0787b0721','7f0e27f0e47f531b0b0bb0b6fb0722','7f0e397bd07f595b0b0bc920fb0722',
              '977837f0e37f14998082b0723b06bd','7f07e7f0e37f149b0723b0787b0721','7f0e27f0e47f531b0723b0b6fb0722',
              '7f0e397bd07f595b0b0bc920fb0722','977837f0e37f14898082b0723b02d5','7ec967f0e37f14998082b0787b0721',
              '7f07e7f0e47f531b0723b0b6fb0722','7f0e37f1487f595b0b0bb0b6fb0722','7f0e37f0e37f14898082b0723b02d5',
              '7ec967f0e37f14998082b0787b0721','7f07e7f0e47f531b0723b0b6fb0722','7f0e37f1487f531b0b0bb0b6fb0722',
              '7f0e37f0e37f14898082b0723b02d5','7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721',
              '7f0e37f1487f531b0b0bb0b6fb0722','7f0e37f0e37f14898082b072297c35','7ec967f0e37f14998082b0787b06bd',
              '7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722','7f0e37f0e37f14898082b072297c35',
              '7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722',
              '7f0e37f0e366aa89801eb072297c35','7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f149b0723b0787b0721',
              '7f0e27f1487f531b0b0bb0b6fb0722','7f0e37f0e366aa89801eb072297c35','7ec967f0e37f14998082b0723b06bd',
              '7f07e7f0e47f149b0723b0787b0721','7f0e27f0e47f531b0723b0b6fb0722','7f0e37f0e366aa89801eb072297c35',
              '7ec967f0e37f14998082b0723b06bd','7f07e7f0e37f14998083b0787b0721','7f0e27f0e47f531b0723b0b6fb0722',
              '7f0e37f0e366aa89801eb072297c35','7ec967f0e37f14898082b0723b02d5','7f07e7f0e37f14998082b0787b0721',
              '7f07e7f0e47f531b0723b0b6fb0722','7f0e36665b66aa89801e9808297c35','665f67f0e37f14898082b0723b02d5',
              '7ec967f0e37f14998082b0787b0721','7f07e7f0e47f531b0723b0b6fb0722','7f0e36665b66a449801e9808297c35',
              '665f67f0e37f14898082b0723b02d5','7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721',
              '7f0e36665b66a449801e9808297c35','665f67f0e37f14898082b072297c35','7ec967f0e37f14998082b0787b06bd',
              '7f07e7f0e47f531b0723b0b6fb0721','7f0e26665b66a449801e9808297c35','665f67f0e37f1489801eb072297c35',
              '7ec967f0e37f14998082b0787b06bd','7f07e7f0e47f531b0723b0b6fb0721','7f0e27f1487f531b0b0bb0b6fb0722'],
 
    /**
      * 數字轉中文速查表
      * @Array Of Property 
      * @trans ['日','一','二','三','四','五','六','七','八','九','十']
      * @return Cn string 
      */
    nStr1:["\u65e5","\u4e00","\u4e8c","\u4e09","\u56db","\u4e94","\u516d","\u4e03","\u516b","\u4e5d","\u5341"],
 
    /**
      * 日期轉農曆稱呼速查表
      * @Array Of Property 
      * @trans ['初','十','廿','卅']
      * @return Cn string 
      */
    nStr2:["\u521d","\u5341","\u5eff","\u5345"],
 
    /**
      * 月份轉農曆稱呼速查表
      * @Array Of Property 
      * @trans ['正','一','二','三','四','五','六','七','八','九','十','冬','臘']
      * @return Cn string 
      */
    nStr3:["\u6b63","\u4e8c","\u4e09","\u56db","\u4e94","\u516d","\u4e03","\u516b","\u4e5d","\u5341","\u51ac","\u814a"],
 
    /**
      * 返回農曆y年一整年的總天數
      * @param lunar Year
      * @return Number
      * @eg:var count = calendar.lYearDays(1987) ;//count=387
      */
    lYearDays:function(y) {
        var i, sum = 348;
        for(i=0x8000; i>0x8; i>>=1) { sum += (calendar.lunarInfo[y-1900] & i)? 1: 0; }
        return(sum+calendar.leapDays(y));
    },
 
    /**
      * 返回農曆y年閏月是哪個月；若y年沒有閏月 則返回0
      * @param lunar Year
      * @return Number (0-12)
      * @eg:var leapMonth = calendar.leapMonth(1987) ;//leapMonth=6
      */
    leapMonth:function(y) { //閏字編碼 \u95f0
        return(calendar.lunarInfo[y-1900] & 0xf);
    },
 
    /**
      * 返回農曆y年閏月的天數 若該年沒有閏月則返回0
      * @param lunar Year
      * @return Number (0、29、30)
      * @eg:var leapMonthDay = calendar.leapDays(1987) ;//leapMonthDay=29
      */
    leapDays:function(y) {
        if(calendar.leapMonth(y))  { 
            return((calendar.lunarInfo[y-1900] & 0x10000)? 30: 29); 
        }
        return(0);
    },
 
    /**
      * 返回農曆y年m月（非閏月）的總天數，計算m為閏月時的天數請使用leapDays方法
      * @param lunar Year
      * @return Number (-1、29、30)
      * @eg:var MonthDay = calendar.monthDays(1987,9) ;//MonthDay=29
      */
    monthDays:function(y,m) {
        if(m>12 || m<1) {return -1}//月份引數從1至12，引數錯誤返回-1
        return( (calendar.lunarInfo[y-1900] & (0x10000>>m))? 30: 29 );
    },
 
    /**
      * 返回公曆(!)y年m月的天數
      * @param solar Year
      * @return Number (-1、28、29、30、31)
      * @eg:var solarMonthDay = calendar.leapDays(1987) ;//solarMonthDay=30
      */
    solarDays:function(y,m) {
        if(m>12 || m<1) {return -1} //若引數錯誤 返回-1
        var ms = m-1;
        if(ms==1) { //2月份的閏平規律測算後確認返回28或29
            return(((y%4 == 0) && (y%100 != 0) || (y%400 == 0))? 29: 28);
        }else {
            return(calendar.solarMonth[ms]);
        }
    },
 
    /**
     * 農曆年份轉換為干支紀年
     * @param  lYear 農曆年的年份數
     * @return Cn string
     */
    toGanZhiYear:function(lYear) {
        var ganKey = (lYear - 3) % 10;
        var zhiKey = (lYear - 3) % 12;
        if(ganKey == 0) ganKey = 10;//如果餘數為0則為最後一個天干
        if(zhiKey == 0) zhiKey = 12;//如果餘數為0則為最後一個地支
        return calendar.Gan[ganKey-1] + calendar.Zhi[zhiKey-1];
        
    },
 
    /**
     * 公曆月、日判斷所屬星座
     * @param  cMonth [description]
     * @param  cDay [description]
     * @return Cn string
     */
    toAstro:function(cMonth,cDay) {
        var s   = "\u9b54\u7faf\u6c34\u74f6\u53cc\u9c7c\u767d\u7f8a\u91d1\u725b\u53cc\u5b50\u5de8\u87f9\u72ee\u5b50\u5904\u5973\u5929\u79e4\u5929\u874e\u5c04\u624b\u9b54\u7faf";
        var arr = [20,19,21,21,21,22,23,23,23,23,22,22];
        return s.substr(cMonth*2 - (cDay < arr[cMonth-1] ? 2 : 0),2) + "\u5ea7";//座
    },
 
    /**
      * 傳入offset偏移量返回干支
      * @param offset 相對甲子的偏移量
      * @return Cn string
      */
    toGanZhi:function(offset) {
        return calendar.Gan[offset%10] + calendar.Zhi[offset%12];
    },
 
    /**
      * 傳入公曆(!)y年獲得該年第n個節氣的公曆日期
      * @param y公曆年(1900-2100)；n二十四節氣中的第幾個節氣(1~24)；從n=1(小寒)算起 
      * @return day Number
      * @eg:var _24 = calendar.getTerm(1987,3) ;//_24=4;意即1987年2月4日立春
      */
    getTerm:function(y,n) {
        if(y<1900 || y>2100) {return -1;}
        if(n<1 || n>24) {return -1;}
        var _table = calendar.sTermInfo[y-1900];
        var _info = [
            parseInt('0x'+_table.substr(0,5)).toString() ,
            parseInt('0x'+_table.substr(5,5)).toString(),
            parseInt('0x'+_table.substr(10,5)).toString(),
            parseInt('0x'+_table.substr(15,5)).toString(),
            parseInt('0x'+_table.substr(20,5)).toString(),
            parseInt('0x'+_table.substr(25,5)).toString()
        ];
        var _calday = [
            _info[0].substr(0,1),
            _info[0].substr(1,2),
            _info[0].substr(3,1),
            _info[0].substr(4,2),
            
            _info[1].substr(0,1),
            _info[1].substr(1,2),
            _info[1].substr(3,1),
            _info[1].substr(4,2),
            
            _info[2].substr(0,1),
            _info[2].substr(1,2),
            _info[2].substr(3,1),
            _info[2].substr(4,2),
            
            _info[3].substr(0,1),
            _info[3].substr(1,2),
            _info[3].substr(3,1),
            _info[3].substr(4,2),
            
            _info[4].substr(0,1),
            _info[4].substr(1,2),
            _info[4].substr(3,1),
            _info[4].substr(4,2),
            
            _info[5].substr(0,1),
            _info[5].substr(1,2),
            _info[5].substr(3,1),
            _info[5].substr(4,2),
        ];
        return parseInt(_calday[n-1]);
    },
 
    /**
      * 傳入農曆數字月份返回漢語通俗表示法
      * @param lunar month
      * @return Cn string
      * @eg:var cnMonth = calendar.toChinaMonth(12) ;//cnMonth='臘月'
      */
    toChinaMonth:function(m) { // 月 => \u6708
        if(m>12 || m<1) {return -1} //若引數錯誤 返回-1
        var s = calendar.nStr3[m-1];
        s+= "\u6708";//加上月字
        return s;
    },
 
    /**
      * 傳入農曆日期數字返回漢字表示法
      * @param lunar day
      * @return Cn string
      * @eg:var cnDay = calendar.toChinaDay(21) ;//cnMonth='廿一'
      */
    toChinaDay:function(d){ //日 => \u65e5
        var s;
        switch (d) {
            case 10:
            s = '\u521d\u5341'; break;
        case 20:
            s = '\u4e8c\u5341'; break;
            break;
        case 30:
            s = '\u4e09\u5341'; break;
            break;
        default :
            s = calendar.nStr2[Math.floor(d/10)];
            s += calendar.nStr1[d%10];
        }
        return(s);
    },
 
    /**
      * 年份轉生肖[!僅能大致轉換] => 精確劃分生肖分界線是“立春”
      * @param y year
      * @return Cn string
      * @eg:var animal = calendar.getAnimal(1987) ;//animal='兔'
      */
    getAnimal: function(y) {
        return calendar.Animals[(y - 4) % 12]
    },
 
    /**
      * 傳入陽曆年月日獲得詳細的公曆、農曆object資訊 <=>JSON
      * @param y  solar year
      * @param m  solar month
      * @param d  solar day
      * @return JSON object
      * @eg:console.log(calendar.solar2lunar(1987,11,01));
      */
    solar2lunar:function (y,m,d) { //引數區間1900.1.31~2100.12.31
        if(y<1900 || y>2100) {return -1;}//年份限定、上限
        if(y==1900&&m==1&&d<31) {return -1;}//下限
        if(!y) { //未傳參  獲得當天
            var objDate = new Date();
        }else {
            var objDate = new Date(y,parseInt(m)-1,d)
        }
        var i, leap=0, temp=0;
        //修正ymd引數
        var y = objDate.getFullYear(),m = objDate.getMonth()+1,d = objDate.getDate();
        var offset   = (Date.UTC(objDate.getFullYear(),objDate.getMonth(),objDate.getDate()) - Date.UTC(1900,0,31))/86400000;
        for(i=1900; i<2101 && offset>0; i++) { temp=calendar.lYearDays(i); offset-=temp; }
        if(offset<0) { offset+=temp; i--; }
        
        //是否今天
        var isTodayObj = new Date(),isToday=false;
        if(isTodayObj.getFullYear()==y && isTodayObj.getMonth()+1==m && isTodayObj.getDate()==d) {
            isToday = true;
        }
        //星期幾
        var nWeek = objDate.getDay(),cWeek = calendar.nStr1[nWeek];
        if(nWeek==0) {nWeek =7;}//數字表示周幾順應天朝週一開始的慣例
        //農曆年
        var year = i;
        
        var leap = calendar.leapMonth(i); //閏哪個月
        var isLeap = false;
        
        //效驗閏月
        for(i=1; i<13 && offset>0; i++) {
            //閏月
            if(leap>0 && i==(leap+1) && isLeap==false){ 
                --i;
                isLeap = true; temp = calendar.leapDays(year); //計算農曆閏月天數
            }
            else{
                temp = calendar.monthDays(year, i);//計算農曆普通月天數
            }
            //解除閏月
            if(isLeap==true && i==(leap+1)) { isLeap = false; }
            offset -= temp;
        }
        
        if(offset==0 && leap>0 && i==leap+1)
        if(isLeap){
            isLeap = false;
        }else{ 
            isLeap = true; --i;
        }
        if(offset<0){ offset += temp; --i; }
        //農曆月
        var month   = i;
        //農曆日
        var day     = offset + 1;
        
        //天干地支處理
        var sm      =   m-1;
        var gzY     =   calendar.toGanZhiYear(year);
        
        //月柱 1900年1月小寒以前為 丙子月(60進位制12)
        var firstNode   = calendar.getTerm(year,(m*2-1));//返回當月「節」為幾日開始
        var secondNode  = calendar.getTerm(year,(m*2));//返回當月「節」為幾日開始
        
        //依據12節氣修正干支月
        var gzM     =   calendar.toGanZhi((y-1900)*12+m+11);
        if(d>=firstNode) {
            gzM     =   calendar.toGanZhi((y-1900)*12+m+12);
        }
        
        //傳入的日期的節氣與否
        var isTerm = false;
        var Term   = null;
        if(firstNode==d) {
            isTerm  = true;
            Term    = calendar.solarTerm[m*2-2];
        }
        if(secondNode==d) {
            isTerm  = true;
            Term    = calendar.solarTerm[m*2-1];
        }
        //日柱 當月一日與 1900/1/1 相差天數
        var dayCyclical = Date.UTC(y,sm,1,0,0,0,0)/86400000+25567+10;
        var gzD = calendar.toGanZhi(dayCyclical+d-1);
        //該日期所屬的星座
        var astro = calendar.toAstro(m,d);
        
        return {'lYear':year,'lMonth':month,'lDay':day,'Animal':calendar.getAnimal(year),'IMonthCn':(isLeap?"\u95f0":'')+calendar.toChinaMonth(month),'IDayCn':calendar.toChinaDay(day),'cYear':y,'cMonth':m,'cDay':d,'gzYear':gzY,'gzMonth':gzM,'gzDay':gzD,'isToday':isToday,'isLeap':isLeap,'nWeek':nWeek,'ncWeek':"\u661f\u671f"+cWeek,'isTerm':isTerm,'Term':Term,'astro':astro};
    },
 
    /**
      * 傳入農曆年月日以及傳入的月份是否閏月獲得詳細的公曆、農曆object資訊 <=>JSON
      * @param y  lunar year
      * @param m  lunar month
      * @param d  lunar day
      * @param isLeapMonth  lunar month is leap or not.[如果是農曆閏月第四個引數賦值true即可]
      * @return JSON object
      * @eg:console.log(calendar.lunar2solar(1987,9,10));
      */
    lunar2solar:function(y,m,d,isLeapMonth) {   //引數區間1900.1.31~2100.12.1
        var isLeapMonth = !!isLeapMonth;
        var leapOffset  = 0;
        var leapMonth   = calendar.leapMonth(y);
        var leapDay     = calendar.leapDays(y);
        if(isLeapMonth&&(leapMonth!=m)) {return -1;}//傳參要求計算該閏月公曆 但該年得出的閏月與傳參的月份並不同
        if(y==2100&&m==12&&d>1 || y==1900&&m==1&&d<31) {return -1;}//超出了最大極限值 
        var day  = calendar.monthDays(y,m); 
        var _day = day;
        //bugFix 2016-9-25 
        //if month is leap, _day use leapDays method 
        if(isLeapMonth) {
            _day = calendar.leapDays(y,m);
        }
        if(y < 1900 || y > 2100 || d > _day) {return -1;}//引數合法性效驗
        
        //計算農曆的時間差
        var offset = 0;
        for(var i=1900;i<y;i++) {
            offset+=calendar.lYearDays(i);
        }
        var leap = 0,isAdd= false;
        for(var i=1;i<m;i++) {
            leap = calendar.leapMonth(y);
            if(!isAdd) {//處理閏月
                if(leap<=i && leap>0) {
                    offset+=calendar.leapDays(y);isAdd = true;
                }
            }
            offset+=calendar.monthDays(y,i);
        }
        //轉換閏月農曆 需補充該年閏月的前一個月的時差
        if(isLeapMonth) {offset+=day;}
        //1900年農曆正月一日的公曆時間為1900年1月30日0時0分0秒(該時間也是本農曆的最開始起始點)
        var stmap   =   Date.UTC(1900,1,30,0,0,0);
        var calObj  =   new Date((offset+d-31)*86400000+stmap);
        var cY      =   calObj.getUTCFullYear();
        var cM      =   calObj.getUTCMonth()+1;
        var cD      =   calObj.getUTCDate();
 
        return calendar.solar2lunar(cY,cM,cD);
    }
};

還有對於某月某日是某年的第幾周的一個方法：

function weekthOfYear(year,month,day) {            
            let d1 = new Date(year,0,1);
            let d2 = new Date(year,month-1,day);
            let dS = 24 * 60 * 60 * 1000;
            let firstDay = (7 - d1.getDay()) * dS;
            let weekMS = 7 * dS;
            d1 = d1.getTime();
            d2 = d2.getTime();
            return Math.ceil((d2 - d1 - firstDay)/weekMS) +1;
        }

牛人的文章地址：1990年至2100年公曆、農曆互轉Js程式碼 https://blog.jjonline.cn/userInterFace/173.html