js 获取农历日期

最新推荐文章于 2024-05-13 16:45:04 发布

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本文介绍了一个用于将公历日期转换为农历日期的JavaScript算法。该算法通过一系列数学运算及位操作实现了从公元1921年至2021年间任意公历日期到相应农历日期的精确转换，并提供了获取农历字符串及星期的函数。


var CalendarData = new Array(100);
var madd = new Array(12);
var tgString = "甲乙丙丁戊己庚辛壬癸";
var dzString = "子丑寅卯辰巳午未申酉戌亥";
var numString = "一二三四五六七八九十";
var monString = "正二三四五六七八九十冬腊";
var weekString = "日一二三四五六";
var sx = "鼠牛虎兔龙蛇马羊猴鸡狗猪";
var cYear, cMonth, cDay, TheDate;
CalendarData = new Array(0xA4B, 0x5164B, 0x6A5, 0x6D4, 0x415B5, 0x2B6, 0x957, 0x2092F, 0x497, 0x60C96, 0xD4A, 0xEA5, 0x50DA9, 0x5AD, 0x2B6, 0x3126E, 0x92E, 0x7192D, 0xC95, 0xD4A, 0x61B4A, 0xB55, 0x56A, 0x4155B, 0x25D, 0x92D, 0x2192B, 0xA95, 0x71695, 0x6CA, 0xB55, 0x50AB5, 0x4DA, 0xA5B, 0x30A57, 0x52B, 0x8152A, 0xE95, 0x6AA, 0x615AA, 0xAB5, 0x4B6, 0x414AE, 0xA57, 0x526, 0x31D26, 0xD95, 0x70B55, 0x56A, 0x96D, 0x5095D, 0x4AD, 0xA4D, 0x41A4D, 0xD25, 0x81AA5, 0xB54, 0xB6A, 0x612DA, 0x95B, 0x49B, 0x41497, 0xA4B, 0xA164B, 0x6A5, 0x6D4, 0x615B4, 0xAB6, 0x957, 0x5092F, 0x497, 0x64B, 0x30D4A, 0xEA5, 0x80D65, 0x5AC, 0xAB6, 0x5126D, 0x92E, 0xC96, 0x41A95, 0xD4A, 0xDA5, 0x20B55, 0x56A, 0x7155B, 0x25D, 0x92D, 0x5192B, 0xA95, 0xB4A, 0x416AA, 0xAD5, 0x90AB5, 0x4BA, 0xA5B, 0x60A57, 0x52B, 0xA93, 0x40E95);
madd[0] = 0;
madd[1] = 31;
madd[2] = 59;
madd[3] = 90;
madd[4] = 120;
madd[5] = 151;
madd[6] = 181;
madd[7] = 212;
madd[8] = 243;
madd[9] = 273;
madd[10] = 304;
madd[11] = 334;

function GetBit(m, n) {
    return (m >> n) & 1;
}

function e2c() {
    TheDate = (arguments.length != 3) ? new Date() : new Date(arguments[0], arguments[1], arguments[2]);
    var total, m, n, k;
    var isEnd = false;
    var tmp = TheDate.getYear();
    if (tmp < 1900) {
        tmp += 1900;
    }
    total = (tmp - 1921) * 365 + Math.floor((tmp - 1921) / 4) + madd[TheDate.getMonth()] + TheDate.getDate() - 38;

    if (TheDate.getYear() % 4 == 0 && TheDate.getMonth() > 1) {
        total++;
    }
    for (m = 0; ; m++) {
        k = (CalendarData[m] < 0xfff) ? 11 : 12;
        for (n = k; n >= 0; n--) {
            if (total <= 29 + GetBit(CalendarData[m], n)) {
                isEnd = true;
                break;
            }
            total = total - 29 - GetBit(CalendarData[m], n);
        }
        if (isEnd) break;
    }
    cYear = 1921 + m;
    cMonth = k - n + 1;
    cDay = total;
    if (k == 12) {
        if (cMonth == Math.floor(CalendarData[m] / 0x10000) + 1) {
            cMonth = 1 - cMonth;
        }
        if (cMonth > Math.floor(CalendarData[m] / 0x10000) + 1) {
            cMonth--;
        }
    }
}

function GetcDateString() {
    var tmp = "";
    tmp += tgString.charAt((cYear - 4) % 10);
    tmp += dzString.charAt((cYear - 4) % 12);
    tmp += "(";
    tmp += sx.charAt((cYear - 4) % 12);
    tmp += ")年 ";
    if (cMonth < 1) {
        tmp += "(闰)";
        tmp += monString.charAt(-cMonth - 1);
    } else {
        tmp += monString.charAt(cMonth - 1);
    }
    tmp += "月";
    tmp += (cDay < 11) ? "初" : ((cDay < 20) ? "十" : ((cDay < 30) ? "廿" : "三十"));
    if (cDay % 10 != 0 || cDay == 10) {
        tmp += numString.charAt((cDay - 1) % 10);
    }
    return tmp;
}

function GetLunarDay(solarYear, solarMonth, solarDay) {
//solarYear = solarYear<1900?(1900+solarYear):solarYear;
    if (solarYear < 1921 || solarYear > 2021) {
        return "";
    } else {
        solarMonth = (parseInt(solarMonth) > 0) ? (solarMonth - 1) : 11;
        e2c(solarYear, solarMonth, solarDay);
        return GetcDateString();
    }
}

var D = new Date();
var yy = D.getFullYear();
var mm = D.getMonth() + 1;
var dd = D.getDate();
var ww = D.getDay();
var ss = parseInt(D.getTime() / 1000);
if (yy < 100) yy = "19" + yy;

// $(function () {
//     var nongli = GetLunarDay(yy, mm, dd).split(' ')[1];
//     $('.navbar-weather-wrapper-nl').text(nongli);
//     $('.navbar-weather-wrapper-week').text(getWeek(moment(new Date()).format("dddd")));
// })

function getNongli(){
    return GetLunarDay(yy, mm, dd).split(' ')[1];
}

function getWeekday(){
    return getWeek(moment(new Date()).format("dddd"));
}



function getWeek(week) {
    var ret = '';
    if (week == 'Monday') {
        ret = '周一'
    } else if (week == 'Tuesday') {
        ret = '周二'
    } else if (week == 'Wednesday') {
        ret = '周三'
    } else if (week == 'Thursday') {
        ret = '周四'
    } else if (week == 'Friday') {
        ret = '周五'
    } else if (week == 'Saturday') {
        ret = '周六'
    } else if (week == 'Sunday') {
        ret = '周日'
    }

    return ret;
}

调用方式

console.log(getNongli())