农历换算

CnDate.ts

export interface CnDateObj{
    IMonthCn: string,
    IDayCn: string,
    isLeap: boolean
}

var 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, 0x05ac0, 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

  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

 
var solarMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

/**

 * 数字转中文速查表

* @Array Of Property

* @trans ['日','一','二','三','四','五','六','七','八','九','十']

* @return Cn string

 */

var nStr1 = ['\u65e5', '\u4e00', '\u4e8c', '\u4e09', '\u56db', '\u4e94', '\u516d', '\u4e03', '\u516b', '\u4e5d', '\u5341'];

/**

* 日期转农历称呼速查表

* @Array Of Property

* @trans ['初','十','廿','卅']

* @return Cn string

*/

var nStr2 = ['\u521d', '\u5341', '\u5eff', '\u5345'];

/**

* 月份转农历称呼速查表

* @Array Of Property

* @trans ['正','一','二','三','四','五','六','七','八','九','十','冬','腊']

* @return Cn string

*/

var nStr3 = ['\u6b63', '\u4e8c', '\u4e09', '\u56db', '\u4e94', '\u516d', '\u4e03', '\u516b', '\u4e5d', '\u5341', '\u51ac', '\u814a'];

/**

* 返回农历y年一整年的总天数

* @param lunar Year

 * @return Number

* @eg:var count = calendar.lYearDays(1987) ;//count=387

*/

function lYearDays (y) {
  let i;
  let sum = 348
  for (i = 0x8000; i > 0x8; i >>= 1) { sum += (lunarInfo[y - 1900] & i) ? 1 : 0 }
  return (sum + leapDays(y))
}

/**

* 返回农历y年闰月是哪个月；若y年没有闰月 则返回0

* @param lunar Year

* @return Number (0-12)

 * @eg:var leapMonth = calendar.leapMonth(1987) ;//leapMonth=6

*/

function leapMonth (y) { // 闰字编码 \u95f0
  return (lunarInfo[y - 1900] & 0xf)
}

/**

* 返回农历y年闰月的天数 若该年没有闰月则返回0

* @param lunar Year

* @return Number (0、29、30)

* @eg:var leapMonthDay = calendar.leapDays(1987) ;//leapMonthDay=29

*/

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

/**

* 返回农历y年m月（非闰月）的总天数，计算m为闰月时的天数请使用leapDays方法

* @param lunar Year

* @return Number (-1、29、30)

 * @eg:var MonthDay = calendar.monthDays(1987,9) ;//MonthDay=29

*/

function monthDays (y, m) {
  if (m > 12 || m < 1) { return -1 }// 月份参数从1至12，参数错误返回-1
  return ((lunarInfo[y - 1900] & (0x10000 >> m)) ? 30 : 29)
}

/**

* 返回公历(!)y年m月的天数

* @param solar Year

* @return Number (-1、28、29、30、31)

* @eg:var solarMonthDay = calendar.leapDays(1987) ;//solarMonthDay=30

*/

function solarDays (y, m) {
  if (m > 12 || m < 1) { return -1 } // 若参数错误 返回-1
  let ms = m - 1
  if (ms === 1) { // 2月份的闰平规律测算后确认返回28或29
    return (((y % 4 === 0) && (y % 100 !== 0) || (y % 400 === 0)) ? 29 : 28)
  } else {
    return (solarMonth[ms])
  }
}


function toChinaMonth (m) { // 月 => \u6708
  if (m > 12 || m < 1) { return -1 } // 若参数错误 返回-1
  let s = nStr3[m - 1]
  s += '\u6708' // 加上月字
  return s
}

function toChinaDay (d) { // 日 => \u65e5
  let s
  switch (d) {
    case 10:
      s = '\u521d\u5341'
      break
    case 20:
      s = '\u4e8c\u5341'
      break
    case 30:
      s = '\u4e09\u5341'
      break
    default :
      s = nStr2[Math.floor(d / 10)]
      s += nStr1[d % 10]
  }
  return (s)
}

export default function GetCnDate (y:number, m:number, d:number):CnDateObj { // 参数区间1900.1.31~2100.12.31
  // 年份限定、上限
  if (y < 1900 || y > 2100) {
    return; // undefined转换为数字变为NaN
  }
  // 公历传参最下限
  if (y === 1900 && m === 1 && d < 31) {
    return;
  }

  // 未传参  获得当天
  let objDate = null;
  if (!y) {
    objDate = new Date()
  } else {
    objDate = new Date(y, m - 1, d)
  }
  let i,leap = 0,temp = 0;
  // 修正ymd参数
  y = objDate.getFullYear()
  m = objDate.getMonth() + 1
  d = objDate.getDate()
  let offset = (Date.UTC(objDate.getFullYear(), objDate.getMonth(), objDate.getDate()) - Date.UTC(1900, 0, 31)) / 86400000
  for (i = 1900; i < 2101 && offset > 0; i++) {
    temp = lYearDays(i)
    offset -= temp
  }

  if (offset < 0) {
    offset += temp; i--
  }

  // 农历年

  let year = i,isLeap = false

  leap = leapMonth(i) // 闰哪个月

  // 效验闰月

  for (i = 1; i < 13 && offset > 0; i++) {
    // 闰月
    if (leap > 0 && i === (leap + 1) && isLeap === false) {
      --i
      isLeap = true; temp = leapDays(year) // 计算农历闰月天数
    } else {
      temp = monthDays(year, i)// 计算农历普通月天数
    }

    // 解除闰月

    if (isLeap === true && i === (leap + 1)) { isLeap = false }
    offset -= temp
  }

  // 闰月导致数组下标重叠取反

  if (offset === 0 && leap > 0 && i === leap + 1) {
    if (isLeap) {
      isLeap = false
    } else {
      isLeap = true; --i
    }
  }

  if (offset < 0) {
    offset += temp; --i
  }

  // 农历月

  let month = i
  // 农历日
  let day = offset + 1
  let cnData = {
    // lYear: year, 
    // lMonth: month, 
    // lDay: day,
    IMonthCn: (isLeap ? '\u95f0' : '') + toChinaMonth(month),
    IDayCn: toChinaDay(day), 
    isLeap: isLeap
  }
  return cnData
}

index.tsx

import GetCnDate,{CnDateObj} from './CnDate'

getTodayTime = () => {
        let now = new Date();
        let year = now.getFullYear();
        let month = now.getMonth() + 1;//得到月份
        let date = now.getDate();//得到日期
        let day = now.getDay();//得到周几
        let hours = now.getHours(); //获取当前时间 时
        let week;
        let arr_week = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");
        week = arr_week[day];
        let time = "";
        time = month + "月" + date + "日" + "  " + week;
        let time2 = "";
        let cnDate:CnDateObj = GetCnDate(year,month,date); 
        time2 = "农历  " + cnDate.IMonthCn + cnDate.IDayCn;
    }