ad-bs-date-conversion/AdBsConverter.js

## - Overview

export const calendar_data = {
  '1970': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1971': [31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30, 365],
  '1972': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '1973': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 365],
  '1974': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1975': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '1976': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '1977': [30, 32, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31, 365],
  '1978': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1979': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '1980': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '1981': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30, 365],
  '1982': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1983': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '1984': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '1985': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30, 365],
  '1986': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1987': [31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '1988': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '1989': [31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1990': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1991': [31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '1992': [31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 366],
  '1993': [31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1994': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1995': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30, 365],
  '1996': [31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 366],
  '1997': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1998': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '1999': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2000': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 365],
  '2001': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2002': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2003': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2004': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 365],
  '2005': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2006': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2007': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2008': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31, 365],
  '2009': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2010': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2011': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2012': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30, 365],
  '2013': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2014': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2015': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2016': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30, 365],
  '2017': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2018': [31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2019': [31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 366],
  '2020': [31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2021': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2022': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30, 365],
  '2023': [31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 366],
  '2024': [31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2025': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2026': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2027': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 365],
  '2028': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2029': [31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30, 365],
  '2030': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2031': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 365],
  '2032': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2033': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2034': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2035': [30, 32, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31, 365],
  '2036': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2037': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2038': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2039': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30, 365],
  '2040': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2041': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2042': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2043': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30, 365],
  '2044': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2045': [31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2046': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2047': [31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2048': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2049': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30, 365],
  '2050': [31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 366],
  '2051': [31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2052': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2053': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30, 365],
  '2054': [31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 366],
  '2055': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2056': [31, 31, 32, 31, 32, 30, 30, 29, 30, 29, 30, 30, 365],
  '2057': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2058': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 365],
  '2059': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2060': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2061': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2062': [30, 32, 31, 32, 31, 31, 29, 30, 29, 30, 29, 31, 365],
  '2063': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2064': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2065': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2066': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31, 365],
  '2067': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2068': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2069': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2070': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30, 365],
  '2071': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2072': [31, 32, 31, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2073': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2074': [31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2075': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2076': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30, 365],
  '2077': [31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 29, 31, 366],
  '2078': [31, 31, 31, 32, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2079': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2080': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 30, 365],
  '2081': [31, 31, 32, 32, 31, 30, 30, 30, 29, 30, 30, 30, 366],
  '2082': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30, 365],
  '2083': [31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30, 365],
  '2084': [31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30, 365],
  '2085': [31, 32, 31, 32, 30, 31, 30, 30, 29, 30, 30, 30, 366],
  '2086': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30, 365],
  '2087': [31, 31, 32, 31, 31, 31, 30, 30, 29, 30, 30, 30, 366],
  '2088': [30, 31, 32, 32, 30, 31, 30, 30, 29, 30, 30, 30, 365],
  '2089': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30, 365],
  '2090': [30, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30, 365],
  '2091': [31, 31, 32, 31, 31, 31, 30, 30, 29, 30, 30, 30, 366],
  '2092': [31, 31, 32, 32, 31, 30, 30, 30, 29, 30, 30, 30, 366],
  '2093': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 29, 31, 365],
  '2094': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2095': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
  '2096': [31, 32, 31, 32, 31, 30, 30, 30, 29, 29, 30, 31, 366],
  '2097': [31, 31, 31, 32, 31, 31, 29, 30, 30, 29, 30, 30, 365],
  '2098': [31, 31, 32, 31, 31, 31, 30, 29, 30, 29, 30, 30, 365],
  '2099': [31, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 365],
};

const getSeparatedDateFromBsDate = (BsDate) => {
  let splittedDate = ["-", "-", "-"];
  if (BsDate) {
    splittedDate = BsDate.split("-");
  }
  return {
    day: splittedDate[2],
    month: splittedDate[1],
    year: splittedDate[0]
  }
}

export const getDateMilliseconds = (date, dateType) => {
  dateType = dateType || "BS";
  if (dateType === "BS") {
    date = BSToAD(date);
  }
  return new Date(date).getTime();
}

const findPassedDaysInThatYear = (year, month, day) => {
  let totalDays = 0;
  for (let i = 0; i < month - 1; i++) {
    totalDays += calendar_data[year][i];
  }
  if (day <= calendar_data[year][month - 1]) {
    totalDays += Number(day);
  } else {
    totalDays += calendar_data[year][month - 1];
  }
  return totalDays;
}

const getMilliDifference = (date) => {
  let dayDiff = 0;
  let dateObject = getSeparatedDateFromBsDate(date);
  let year = dateObject.year;
  let month = dateObject.month;
  let day = dateObject.day;
  let passedDays = findPassedDaysInThatYear(year, month, day);
  if (year > 2026) {
    for (let i = 2027; i < year; i++) {
      dayDiff += calendar_data[i][12];
    }
    dayDiff += (passedDays + 102);
  } else if (year < 2026) {
    for (let i = 2025; i > year; i--) {
      dayDiff -= calendar_data[i][12];
    }
    dayDiff -= ((calendar_data[year][12] - passedDays) + 264);
  } else {
    dayDiff += (passedDays - 264);
  }
  return (dayDiff * 24 * 60 * 60 * 1000);
}

export const BSToAD = (date) => {
  date = date.replaceAll("/", "-");
  let dateData = date.split('-').map(d => parseInt(d, 10));

  if ((dateData.length < 3) || !((dateData[0] > 1969) && dateData[0] < 2100) || !((dateData[1] > 0) && (dateData[1] < 13)) || !((dateData[2] > 0) && (dateData[2] <= calendar_data[dateData[0]][dateData[1] - 1]))) {
    if (!!date) {
      dateData.length < 3 ? alert("मान्य ढाँचामा नभएको मिति परिणत हुने छैन") : dateData[0] < 1970 ? alert("१९७० साल भन्दा कम मिति परिणत हुने छैन") : dateData[0] > 2099 ? alert("२०९९ साल भन्दा बढी मिति परिणत हुने छैन") : alert("पात्रोमा नभएको मिति परिणत हुने छैन");
    }

    return null;
  }
  let dateObject = new Date(getMilliDifference(date));
  var year = dateObject.getFullYear();
  var month = ("0" + (dateObject.getMonth() + 1)).slice(-2);
  var day = ("0" + dateObject.getDate()).slice(-2);
  return year + "-" + month + "-" + day;
}

const findBsDateFromTotalNumberOfDays = (year, days) => {
  let month = 0;
  for (let i = 0; i < 12; i++) {
    if (days <= calendar_data[year][i]) {
      month = i + 1;
      break;
    } else {
      days -= calendar_data[year][i];
    }
  }
  return {
    bsYear: year,
    bsMonth: month,
    bsDay: days
  }
}

export const findLastDayOfMonthOfAdDate = (year, month) => {
  let nextMonth = Number(month) + 1;
  if (nextMonth > 12) {
    nextMonth = 1;
    year = Number(year) + 1;
  }
  let milliDate = (new Date(year + "-" + ("0" + nextMonth).slice(-2) + "-" + "01").getTime()) - (24 * 60 * 60 * 1000);
  return (new Date(milliDate).getDate());
}

export const findLastDayOfMonthOfBsDate = (year, month) => {
  year = Number(year);
  month = Number(month);
  if ((year < 1970 && year > 2099) || (month > 0 && month < 13)){
    return calendar_data[year][month - 1];
  }
  return null;
}

export const ADToBS = (date) => {
  date = date.replaceAll("/", "-");
  let separatedDate = date.split("-");
  if ((separatedDate.length < 3) || !((separatedDate[1] > 0) && (separatedDate[1] < 13)) || !((separatedDate[2] > 0) && (separatedDate[2] <= findLastDayOfMonthOfAdDate(separatedDate[0], separatedDate[1])))) {
    if (!!date) {
      separatedDate.length < 3 ? alert("मान्य ढाँचामा नभएको मिति परिणत हुने छैन") : alert("पात्रोमा नभएको मिति परिणत हुने छैन");
    }

    return null;
  }
  date = separatedDate[0] + "-" + ("0" + separatedDate[1]).slice(-2) + "-" + ("0" + separatedDate[2]).slice(-2);
  let dateInMillisecond = new Date(date).getTime();
  if (dateInMillisecond >= -1789948800000 && dateInMillisecond <= 2312582400000) {
    let equivalentDay = dateInMillisecond / (24 * 60 * 60 * 1000);
    let year = 2026;
    let currentYear = 0;
    let currentMonth = 0;
    let currentDay = 0;
    let bsDateObject;
    if (equivalentDay > 102) {
      equivalentDay -= 102;
      while (equivalentDay > 0) {
        equivalentDay -= calendar_data[year + 1][12];
        if (equivalentDay <= 0) {
          bsDateObject = findBsDateFromTotalNumberOfDays(year + 1, (equivalentDay + calendar_data[year + 1][12]));
        } else {
          year++;
        }
      }
    } else if (equivalentDay < -264) {
      equivalentDay = -equivalentDay;
      equivalentDay -= 264;
      while (equivalentDay > 0) {
        equivalentDay -= calendar_data[year - 1][12];
        if (equivalentDay <= 0) {
          if (equivalentDay === 0) {
            bsDateObject = findBsDateFromTotalNumberOfDays(year - 2, calendar_data[year - 2][12]);
          } else {
            bsDateObject = findBsDateFromTotalNumberOfDays(year - 1, (-equivalentDay));
          }
        } else {
          year--;
        }
      }
    } else {
      bsDateObject = findBsDateFromTotalNumberOfDays(year, (264 + Number(equivalentDay)));
    }
    currentDay = bsDateObject.bsDay;
    currentMonth = bsDateObject.bsMonth;
    currentYear = bsDateObject.bsYear;
    return currentYear + "-" + ("0" + currentMonth).slice(-2) + "-" + ("0" + currentDay).slice(-2);
  } else {
    alert("परिणत गर्न खोजिएको मिति हाम्रो पात्रोमा अवस्थित छैन");
    return null;
  }
}