freedakgmail
329 lines
9.4 KiB
TypeScript
329 lines
9.4 KiB
TypeScript
/**
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* 农历转换工具
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* 支持 1900-2100 年的公历农历互转
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*/
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// 农历数据表 (1900-2100)
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// 每个数字的后12位代表12个月，1为大月(30天)，0为小月(29天)
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// 前4位代表闰月月份，0表示无闰月
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const lunarInfo = [
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0x04bd8, 0x04ae0, 0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0, 0x055d2,
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0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540, 0x0d6a0, 0x0ada2, 0x095b0, 0x14977,
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0x04970, 0x0a4b0, 0x0b4b5, 0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970,
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0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3, 0x092e0, 0x1c8d7, 0x0c950,
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0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0, 0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557,
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0x06ca0, 0x0b550, 0x15355, 0x04da0, 0x0a5b0, 0x14573, 0x052b0, 0x0a9a8, 0x0e950, 0x06aa0,
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0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570, 0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0,
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0x096d0, 0x04dd5, 0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b6a0, 0x195a6,
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0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50, 0x06d40, 0x0af46, 0x0ab60, 0x09570,
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0x04af5, 0x04970, 0x064b0, 0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0,
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0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7, 0x025d0, 0x092d0, 0x0cab5,
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0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50, 0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930,
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0x07954, 0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260, 0x0ea65, 0x0d530,
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0x05aa0, 0x076a3, 0x096d0, 0x04afb, 0x04ad0, 0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45,
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0x0b5a0, 0x056d0, 0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20, 0x0ada0,
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0x14b63, 0x09370, 0x049f8, 0x04970, 0x064b0, 0x168a6, 0x0ea50, 0x06b20, 0x1a6c4, 0x0aae0,
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0x0a2e0, 0x0d2e3, 0x0c960, 0x0d557, 0x0d4a0, 0x0da50, 0x05d55, 0x056a0, 0x0a6d0, 0x055d4,
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0x052d0, 0x0a9b8, 0x0a950, 0x0b4a0, 0x0b6a6, 0x0ad50, 0x055a0, 0x0aba4, 0x0a5b0, 0x052b0,
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0x0b273, 0x06930, 0x07337, 0x06aa0, 0x0ad50, 0x14b55, 0x04b60, 0x0a570, 0x054e4, 0x0d160,
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0x0e968, 0x0d520, 0x0daa0, 0x16aa6, 0x056d0, 0x04ae0, 0x0a9d4, 0x0a2d0, 0x0d150, 0x0f252,
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0x0d520,
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]
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// 天干
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const Gan = ['甲', '乙', '丙', '丁', '戊', '己', '庚', '辛', '壬', '癸']
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// 地支
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const Zhi = ['子', '丑', '寅', '卯', '辰', '巳', '午', '未', '申', '酉', '戌', '亥']
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// 生肖
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const Animals = ['鼠', '牛', '虎', '兔', '龙', '蛇', '马', '羊', '猴', '鸡', '狗', '猪']
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// 农历月份
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const lunarMonths = ['正', '二', '三', '四', '五', '六', '七', '八', '九', '十', '冬', '腊']
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// 农历日期
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const lunarDays = [
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'初一', '初二', '初三', '初四', '初五', '初六', '初七', '初八', '初九', '初十',
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'十一', '十二', '十三', '十四', '十五', '十六', '十七', '十八', '十九', '二十',
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'廿一', '廿二', '廿三', '廿四', '廿五', '廿六', '廿七', '廿八', '廿九', '三十',
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]
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/**
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* 获取农历年份的闰月月份
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* @param year 农历年份
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* @returns 闰月月份，0表示无闰月
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*/
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function leapMonth(year: number): number {
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return lunarInfo[year - 1900] & 0xf
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}
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/**
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* 获取农历年份的闰月天数
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* @param year 农历年份
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* @returns 闰月天数
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*/
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function leapDays(year: number): number {
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if (leapMonth(year)) {
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return lunarInfo[year - 1900] & 0x10000 ? 30 : 29
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}
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return 0
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}
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/**
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* 获取农历年份的总天数
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* @param year 农历年份
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* @returns 总天数
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*/
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function yearDays(year: number): number {
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let sum = 348
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for (let i = 0x8000; i > 0x8; i >>= 1) {
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sum += lunarInfo[year - 1900] & i ? 1 : 0
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}
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return sum + leapDays(year)
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}
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/**
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* 获取农历年份某月的天数
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* @param year 农历年份
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* @param month 农历月份
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* @returns 该月天数
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*/
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function monthDays(year: number, month: number): number {
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return lunarInfo[year - 1900] & (0x10000 >> month) ? 30 : 29
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}
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/**
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* 公历转农历
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* @param date 公历日期
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* @returns 农历信息,如果日期超出范围则返回null
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*/
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export function solar2lunar(date: Date) {
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const inputYear = date.getFullYear()
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// 检查年份范围
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if (inputYear < 1900 || inputYear > 2100) {
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return null
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}
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const baseDate = new Date(1900, 0, 31)
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let offset = Math.floor((date.getTime() - baseDate.getTime()) / 86400000)
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let year = 1900
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let daysInYear = 0
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// 计算农历年份
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while (year < 2101 && offset > 0) {
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daysInYear = yearDays(year)
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offset -= daysInYear
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year++
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}
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if (offset < 0) {
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offset += daysInYear
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year--
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}
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// 农历年份
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const lunarYear = year
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const leap = leapMonth(year)
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let isLeap = false
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// 计算农历月份
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let month = 1
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let daysOfMonth = 0
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for (month = 1; month <= 12 && offset > 0; month++) {
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// 闰月
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if (leap > 0 && month === leap + 1 && !isLeap) {
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--month
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isLeap = true
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daysOfMonth = leapDays(year)
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} else {
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daysOfMonth = monthDays(year, month)
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}
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// 解除闰月
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if (isLeap && month === leap + 1) {
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isLeap = false
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}
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offset -= daysOfMonth
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}
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// 修正月份
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if (offset === 0 && leap > 0 && month === leap + 1) {
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if (isLeap) {
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isLeap = false
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} else {
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isLeap = true
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--month
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}
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}
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if (offset < 0) {
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offset += daysOfMonth
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--month
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}
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const lunarMonth = month
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const lunarDay = offset + 1
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// 计算干支年
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const ganIndex = (lunarYear - 4) % 10
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const zhiIndex = (lunarYear - 4) % 12
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const ganZhiYear = Gan[ganIndex] + Zhi[zhiIndex]
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// 生肖
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const animal = Animals[(lunarYear - 4) % 12]
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// 确保月份和日期在有效范围内
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const validMonth = Math.max(1, Math.min(12, lunarMonth))
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const validDay = Math.max(1, Math.min(30, lunarDay))
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return {
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lunarYear,
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lunarMonth: validMonth,
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lunarDay: validDay,
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isLeap,
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ganZhiYear,
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animal,
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monthName: (isLeap ? '闰' : '') + (lunarMonths[validMonth - 1] || '未知') + '月',
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dayName: lunarDays[validDay - 1] || '未知',
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toString: function () {
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return `${this.ganZhiYear}年(${this.animal})${this.monthName}${this.dayName}`
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},
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}
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}
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/**
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* 农历转公历
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* @param year 农历年份
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* @param month 农历月份
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* @param day 农历日期
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* @param isLeap 是否闰月
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* @returns 公历日期
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*/
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export function lunar2solar(year: number, month: number, day: number, isLeap = false): Date | null {
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if (year < 1900 || year > 2100) {
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return null
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}
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const leap = leapMonth(year)
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if (isLeap && leap !== month) {
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return null
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}
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// 计算从1900年1月31日到目标日期的天数
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let offset = 0
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// 累加年份天数
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for (let i = 1900; i < year; i++) {
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offset += yearDays(i)
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}
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// 累加月份天数
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let leapFlag = false
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for (let i = 1; i < month; i++) {
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offset += monthDays(year, i)
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}
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// 如果是闰月，需要加上闰月之前的月份
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if (leap > 0 && month > leap) {
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offset += leapDays(year)
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if (month === leap + 1 && isLeap) {
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leapFlag = true
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}
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}
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// 加上日期
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offset += day - 1
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const baseDate = new Date(1900, 0, 31)
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const resultDate = new Date(baseDate.getTime() + offset * 86400000)
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return resultDate
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}
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/**
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* 格式化日期为 YYYY-MM-DD
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*/
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export function formatDate(date: Date): string {
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const year = date.getFullYear()
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const month = String(date.getMonth() + 1).padStart(2, '0')
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const day = String(date.getDate()).padStart(2, '0')
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return `${year}-${month}-${day}`
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}
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/**
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* 解析 YYYY-MM-DD 格式的日期字符串
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*/
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export function parseDate(dateStr: string): Date | null {
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if (!dateStr) return null
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const parts = dateStr.split('-')
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if (parts.length !== 3) return null
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const year = parseInt(parts[0])
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const month = parseInt(parts[1]) - 1
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const day = parseInt(parts[2])
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return new Date(year, month, day)
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}
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/**
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* 检查某个日期是否在当前月份
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* @param dateStr 日期字符串 YYYY-MM-DD
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* @param isLunar 是否按农历计算
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* @returns 如果在当前月份返回日期信息,否则返回null
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*/
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export function isInCurrentMonth(dateStr: string, isLunar: boolean = false): { day: number; month: number } | null {
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const date = parseDate(dateStr)
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if (!date) return null
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const now = new Date()
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const currentYear = now.getFullYear()
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const currentMonth = now.getMonth() + 1
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if (isLunar) {
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// 按农历计算:获取原日期的农历信息
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const originalLunar = solar2lunar(date)
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if (!originalLunar) return null
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// 计算今年对应的农历日期的公历日期
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const thisYearSolar = lunar2solar(
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currentYear,
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originalLunar.lunarMonth,
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originalLunar.lunarDay,
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originalLunar.isLeap
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)
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if (!thisYearSolar) {
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// 如果转换失败，尝试用明年的日期
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const nextYearSolar = lunar2solar(
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currentYear + 1,
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originalLunar.lunarMonth,
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originalLunar.lunarDay,
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originalLunar.isLeap
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)
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if (nextYearSolar) {
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const nextYearMonth = nextYearSolar.getMonth() + 1
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const nextYearDay = nextYearSolar.getDate()
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if (nextYearMonth === currentMonth) {
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return { day: nextYearDay, month: nextYearMonth }
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}
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}
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return null
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}
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const thisYearMonth = thisYearSolar.getMonth() + 1
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const thisYearDay = thisYearSolar.getDate()
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if (thisYearMonth === currentMonth) {
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return { day: thisYearDay, month: thisYearMonth }
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}
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} else {
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// 按公历计算:直接比较月份
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const month = date.getMonth() + 1
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const day = date.getDate()
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if (month === currentMonth) {
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return { day, month }
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}
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}
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return null
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}
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