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/*
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* 阳历转农历：
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* getLunarDate: getLunarDate
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* 返回值格式：yyyy-MM-DD
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*
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*
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* 获取农历信息：
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* getLunarDateString: getLunarDateString
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* 返回值格式：{day: "一",dz: "未",month: "腊",tg: "辛",year: "羊"}
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*
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*/
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let lunar = {
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tg: '甲乙丙丁戊己庚辛壬癸',
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dz: '子丑寅卯辰巳午未申酉戌亥',
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number: '一二三四五六七八九十',
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year: '鼠牛虎兔龙蛇马羊猴鸡狗猪',
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month: '正二三四五六七八九十冬腊',
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monthadd: [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334],
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calendar: [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],
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};
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// 获取阴历日期
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const getLunarDate = (date) => {
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let useDate = new Date();
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let year,
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month,
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day;
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if (!date) {
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date = new Date(), year = date.getFullYear(), month = date.getMonth(), day = date.getDate();
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} else {
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date = date.split('-'), year = parseInt(date[0]), month = date[1] - 1, day = parseInt(date[2]);
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}
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if (year < 2000 || year > 2050) {
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return {};
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}
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let total,
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m,
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n,
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k,
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bit,
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lunarYear,
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lunarMonth,
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lunarDay;
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let isEnd = false;
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let tmp = year;
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if (tmp < 1900) {
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tmp += 1900;
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}
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total = (tmp - 1921) * 365 + Math.floor((tmp - 1921) / 4) + lunar.monthadd[month] + day - 38;
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if (year % 4 == 0 && month > 1) {
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total++;
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}
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for (m = 0; ; m++) {
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k = (lunar.calendar[m] < 0xfff) ? 11 : 12;
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for (n = k; n >= 0; n--) {
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bit = (lunar.calendar[m] >> n) & 1;
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if (total <= 29 + bit) {
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isEnd = true;
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break;
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}
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total = total - 29 - bit;
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}
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if (isEnd) break;
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}
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lunarYear = 1921 + m;
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lunarMonth = k - n + 1;
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lunarDay = total;
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if (k == 12) {
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if (lunarMonth == Math.floor(lunar.calendar[m] / 0x10000) + 1) {
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lunarMonth = 1 - lunarMonth;
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}
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if (lunarMonth > Math.floor(lunar.calendar[m] / 0x10000) + 1) {
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lunarMonth--;
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}
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}
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return {
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lunarYear,
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lunarMonth,
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lunarDay,
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};
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};
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// 获取阴历年信息
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const getLunarDateString = (lunarDate) => {
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if (!lunarDate.lunarDay) return;
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let data = {};
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let lunarYear = lunarDate.lunarYear;
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let lunarMonth = lunarDate.lunarMonth;
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let lunarDay = lunarDate.lunarDay;
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data.tg = lunar.tg.charAt((lunarYear - 4) % 10);
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data.dz = lunar.dz.charAt((lunarYear - 4) % 12);
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data.year = lunar.year.charAt((lunarYear - 4) % 12);
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data.month = lunarMonth < 1 ? `(闰)${lunar.month.charAt(-lunarMonth - 1)}` : lunar.month.charAt(lunarMonth - 1);
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data.day = (lunarDay < 11) ? '初' : ((lunarDay < 20) ? '十' : ((lunarDay < 30) ? '廿' : '三十'));
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if (lunarDay % 10 != 0 || lunarDay == 10) {
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data.day += lunar.number.charAt((lunarDay - 1) % 10);
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}
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return data;
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};
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module.exports = {
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getLunarDate: getLunarDate, // 返回值 yyyy-MM-DD
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getLunarDateString: getLunarDateString// 返回值{day: "一",dz: "未",month: "腊",tg: "辛",year: "羊"}
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}
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