project/utils/lunarFn.js

/**
 * 获取某个日期的农历
 * @parmas {newDate} 日期 年-月-日
 */
const getLunar = function(newDate) {
    var nyear;
    var nmonth;
    var nday = -1;
    var nwday;
    var nhrs;
    var nmin;
    var nsec;
    var newDate = newDate;

    var lmonth, lday, lleap; //农历参数

    function Draw () {
        NewTick();
        //显示时间
        var s = nyear + '年' + nmonth + '月' + nday + '日 ' + '星期' + cweekday(nwday) + ' ' + shapetime(nhrs, nmin, nsec);
        s += " 农历" + lmonth + "月" + lday; //农历
        var lunar_month_day = lmonth + "月" + lday;
        console.log(lunar_month_day);
        return lunar_month_day;
    }


    function NewTick () {
        var noww = newDate ? new Date(newDate) : new Date();
        if (noww.getDate() != nday) {
            nyear = noww.getFullYear();
            nmonth = noww.getMonth() + 1;
            nwday = noww.getDay();
            nday = noww.getDate();

            getlunar(); //获取农历
        }
        nhrs = noww.getHours();
        nmin = noww.getMinutes();
        nsec = noww.getSeconds();
    }


    //辅助函数
    var hzWeek = new Array("日", "一", "二", "三", "四", "五", "六", "日");

    function cweekday (wday) {
        return hzWeek[wday];
    }

    function shapetime (vhrs, vmin, vsec) {
        if (vsec <= 9) vsec = "0" + vsec;
        if (vmin <= 9) vmin = "0" + vmin;
        if (vhrs <= 9) vhrs = "0" + vhrs;
        return vhrs + ":" + vmin + ":" + vsec
    }

    //农历函数开始
    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, 0x0a5b0, 0x14573, 0x052b0, 0x0a9a8, 0x0e950, 0x06aa0, 0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b6a0, 0x195a6, 0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570, 0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x05ac0, 0x0ab60, 0x096d5, 0x092e0, //1990
        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, 0x14b63);

    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));
    }

    function leapDays (y) {
        if (leapMonth(y)) return ((lunarInfo[y - 1900] & 0x10000) ? 30 : 29);
        else return (0);
    }

    function leapMonth (y) {
        return (lunarInfo[y - 1900] & 0xf);
    }

    function monthDays (y, m) {
        return ((lunarInfo[y - 1900] & (0x10000 >> m)) ? 30 : 29);
    }

    function Lunar (y, m, d) {
        var i, leap = 0,
            temp = 0;
        var offset = (Date.UTC(y, m, d) - Date.UTC(1900, 0, 31)) / 86400000;
        for (i = 1900; i < 2050 && offset > 0; i++) {
            temp = lYearDays(i);
            offset -= temp;
        }
        if (offset < 0) {
            offset += temp;
            i--;
        }
        this.year = i;
        leap = leapMonth(i);
        this.isLeap = false;
        for (i = 1; i < 13 && offset > 0; i++) {
            if (leap > 0 && i == (leap + 1) && this.isLeap == false) {
                --i;
                this.isLeap = true;
                temp = leapDays(this.year);
            } else {
                temp = monthDays(this.year, i);
            }
            if (this.isLeap == true && i == (leap + 1)) this.isLeap = false;
            offset -= temp;
        }
        if (offset == 0 && leap > 0 && i == leap + 1) if (this.isLeap) {
            this.isLeap = false;
        } else {
            this.isLeap = true;
            --i;
        }
        if (offset < 0) {
            offset += temp;
            --i;
        }
        this.month = i;
        this.day = offset + 1;
    }

    var nStr1 = new Array('', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十', '冬', '十二');
    var nStr2 = new Array('初', '十', '廿', '卅', '□');

    function GetcDay (d) {
        var s;
        switch (d) {
            case 10:
                s = '初十';
                break;
            case 20:
                s = '二十';
                break;
            case 30:
                s = '三十';
                break;
            default:
                s = nStr2[Math.floor(d / 10)];
                s += nStr1[d % 10];
                break;
        }
        return (s);
    }

    function GetcMon (m) {
        if (m == 1) return '正';
        else return nStr1[m];
    }

    function getlunar () {
        var lObj = new Lunar(nyear, nmonth - 1, nday);
        lmonth = GetcMon(lObj.month);
        lday = GetcDay(lObj.day);
        lleap = lObj.isLeap;
        if (lleap == 1) {
            lmonth = "闰" + lmonth;
        }
    }
    //农历函数结束
    return Draw();
}
const getDate = function(date) {
    let year = date.getFullYear();
    let month = date.getMonth() + 1;
    let day = date.getDate();
    return year + '-' + month + '-' + day;
}
module.exports = {
	getLunar:getLunar,
	getDate:getDate,
}