Converts date in Bikram Sambat to A.D. and vice versa in typescript/javascript.

BsToAdConverter.ts

export class NepaliDateConverterService {
  nums = {
    0: '०',
    1: '१',
    2: '२',
    3: '३',
    4: '४',
    5: '५',
    6: '६',
    7: '७',
    8: '८',
    9: '९'
  };
  defaults = {
    lang: 'ne', // possible values: ne for nepali text, en for english text
    // dateFormat: 'yyyy/mm/dd',     // not implemented yet
    monthFormat: 'full',  // possible values: full for full name, short for short name
    daysFormat: 'min',    // possible values: full for full name, short for short name and min for minified name
  };
  ne = {
    monthsName: ['बैशाख', 'जेष्ठ', 'आषाढ', 'श्रावण', 'भाद्र', 'आश्विन', 'कार्तिक', 'मंसिर', 'पौष', 'माघ', 'फाल्गुन', 'चैत्र'],
    monthsShortName: ['बै', 'जे', 'आषा', 'श्रा', 'भा', 'आश', 'का', 'मं', 'पौ', 'मा', 'फा', 'चै'],
  };
  en = {
    monthsName: ['Baisakh', 'Jestha', 'Ashadh', 'Shrawan', 'Bhadra', 'Ashwin', 'Kartik', 'Mangsir', 'Paush', 'Mangh', 'Falgun', 'Chaitra'],
    monthsShortName: ['Bai', 'Je', 'As', 'Shra', 'Bha', 'Ash', 'Kar', 'Mang', 'Pau', 'Ma', 'Fal', 'Chai'],
  };
  engDaysName = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
  engDaysShortName = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
  engMonthsName = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];
  engMonthsShortName = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
  daysInYear = 365;
  minMonth = 1;
  minDays = 1;
  maxMonth = 12;
  maxDays = 32;
  // tslint:disable-next-line:variable-name
  base_ad = {year: 2017, month: 2, day: 11, dayOfWeek: 6}; // dayOfWeek: 0 for sunday, 1 for monday and so on
  // tslint:disable-next-line:variable-name
  base_bs = {year: 2073, month: 10, day: 29, dayOfWeek: 6};
  // tslint:disable-next-line:variable-name
  calendar_data = {
    '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 ]
  };

  /*
   * gathered data below; if anybody can validate below, thanks!
   * A hacky way is to iterate for the unknown dates is to use daysPerYear and loop through
   *
   '2093': [ 31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30, 366 ],
   '2094': [ 31, 31, 32, 31, 31, 30, 30, 30, 29, 30, 30, 30, 365 ],
   '2095': [ 31, 31, 32, 31, 31, 31, 30, 29, 30, 30, 30, 30, 366 ],
   '2096': [ 30, 31, 32, 32, 31, 30, 30, 29, 30, 29, 30, 30, 364 ],
   '2097': [ 31, 32, 31, 32, 31, 30, 30, 30, 29, 30, 30, 30, 366 ],
   '2098': [ 31, 31, 32, 31, 31, 31, 29, 30, 29, 30, 30, 31, 366 ],
   '2099': [ 31, 31, 32, 31, 31, 31, 30, 29, 29, 30, 30, 30, 365 ],
   '2100': [ 31, 32, 31, 32, 30, 31, 30, 29, 30, 29, 30, 30, 365 ]
   */

  getNepaliNumber(strNum) {
    const arrNumNe = strNum.toString().split('').map( (ch) => {
      if (ch === '.' || ch === ',') {
        return ch;
      }
      return this.nums[Number(ch)];
    });
    return arrNumNe.join('');
  }
  getNepDayOfWeek(inp, opts?) {
    if (Object.prototype.toString.call(inp) === '[object Object]') {
      opts = inp;
      inp = undefined;
    }
    if (inp !== undefined && Object.prototype.toString.call(inp) !== '[object Date]' && typeof inp !== 'number') {
      return new TypeError('Expected a date object or a number');
    }

    if (typeof inp === 'number' && (inp < 0 || inp > 6)) {
      return new RangeError('Expected the value of inp between 0-6');
    }

    opts = opts || {};

    const data: any = {};
    data.ne = {
      full: ['आइतबार', 'सोमबार', 'मंगलबार', 'बुधबार', 'बिहिबार', 'शुक्रबार', 'शनिबार'],
      short: ['आइत', 'सोम', 'मंगल', 'बुध', 'बिहि', 'शुक्र', 'शनि'],
      min: ['आ', 'सो', 'मं', 'बु', 'बि', 'शु', 'श']
    };
    data.en = {
      full: ['Aaitabaar', 'Sombaar', 'Mangalbaar', 'Budhabaar', 'Bihibaar', 'Shukrabaar', 'Shanibaar'],
      short: ['Aaita', 'Som', 'Mangal', 'Budha', 'Bihi', 'Shukra', 'Shani'],
      min: ['Aai', 'So', 'Man', 'Bu', 'Bi', 'Shu', 'Sha']
    };

    let lang = 'ne';

    if (opts.lang === 'en') {
      lang = 'en';
    }

    if (inp === undefined) {
      inp = new Date().getDay();
    }

    if (Object.prototype.toString.call(inp) === '[object Date]') {
      inp = inp.getDay();
    }

    if (!opts.type) {
      const nepday = {
        full: data[lang].full[inp],
        short: data[lang].short[inp],
        min: data[lang].min[inp]
      };
      return nepday;
    }

    switch (opts.type) {
      case 'short':
        return data[lang].short[inp];
      case 'min':
        return data[lang].min[inp];
      default:
        return data[lang].full[inp];
    }
  }
  constructor() {
  }
  countDaysInYear(year) {
    if (typeof this.calendar_data[year] === 'undefined') {
      return this.daysInYear;
    }

    return this.calendar_data[year][12];
  }

  isLeapYear(year) {
    return (this.daysInYear !== this.countDaysInYear(year));
  }

  countBSDays(date) {
    let dayCount = 0;
    const dateArr = date.split('/').map((str) => {
      return Number(str);
    });

    const dateObj = {year: dateArr[0], month: dateArr[1], day: dateArr[2]};

    let inc = false;
    if (dateArr[0] > this.base_bs.year) {
      inc = true;
    } else if (dateArr[0] === this.base_bs.year && dateArr[1] > this.base_bs.month) {
      inc = true;
    } else if (dateArr[0] === this.base_bs.year && dateArr[1] === this.base_bs.month && dateArr[2] > this.base_bs.day) {
      inc = true;
    }

    let start: any = {};
    let end: any = {};
    let factor = 1;

    if (inc === true) {
      start = this.base_bs;
      end = dateObj;
    } else {
      start = dateObj;
      end = this.base_bs;
      factor = -1;
    }

    for (let i = start.year; i <= end.year; i++) {
      dayCount += this.calendar_data[i][12];
    }

    for (let i = 0; i < start.month - 1; i++) {
      dayCount -= this.calendar_data[start.year][i];
    }

    // dayCount += calendar_data[start.year][12 - 1];

    for (let i = end.month - 1; i < 12; i++) {
      dayCount -= this.calendar_data[end.year][i];
    }

    dayCount -= start.day;
    dayCount += end.day;
    return (dayCount * factor);
  }

  countADDays(date) {
    const dayCount = 0, i = 0;
    const dateArr = date.split('/').map((str) => {
      return Number(str);
    });

    const dateObj = {year: dateArr[0], month: dateArr[1] - 1, day: dateArr[2]};

    const date1 = new Date(this.base_ad.year, this.base_ad.month - 1, this.base_ad.day);
    const date2 = new Date(dateObj.year, dateObj.month, dateObj.day);
    const timeDiff = date2.getTime() - date1.getTime();
    const diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
    return {diffDays, dateInAd: date2};
  }

  offsetBSDays(dayData) {
    let dayCount = dayData.diffDays;
    const dateInAd = dayData.dateInAd;
    const bs_date = JSON.parse(JSON.stringify(this.base_bs));
    if (dayCount >= 0) {
      bs_date.day += dayCount;
      while (bs_date.day > this.calendar_data[bs_date.year][bs_date.month - 1]) {
        bs_date.day -= this.calendar_data[bs_date.year][bs_date.month - 1];
        bs_date.month++;
        if (bs_date.month > 12) {
          bs_date.year++;
          bs_date.month = 1;
        }
      }
    } else {
      dayCount = Math.abs(dayCount);
      while (dayCount >= 0) {
        if (dayCount < this.calendar_data[bs_date.year][bs_date.month - 1]) {
          dayCount = this.calendar_data[bs_date.year][bs_date.month - 1] - dayCount;
          break;
        }
        dayCount -= this.calendar_data[bs_date.year][bs_date.month - 1];
        bs_date.month--;
        if (bs_date.month === 0) {
          bs_date.year--;
          bs_date.month = 12;
        }
      }
      bs_date.day = dayCount;
    }
    const month = dateInAd.getMonth(),
        dayOfWeek = dateInAd.getDay();
    const npDayOfWeek = this.getNepDayOfWeek(dayOfWeek),
        enDayOfWeek = this.getNepDayOfWeek(dayOfWeek, {lang: 'en'});

    const totalDays = this.calendar_data[bs_date.year][bs_date.month - 1]
    const dateObj = {
      ne: {
        year: this.getNepaliNumber(bs_date.year),
        month: this.getNepaliNumber(bs_date.month),
        day: this.getNepaliNumber(bs_date.day),
        strMonth: this.ne.monthsName[bs_date.month - 1],
        strShortMonth: this.ne.monthsShortName[bs_date.month - 1],
        dayOfWeek: this.getNepaliNumber(dayOfWeek),
        strDayOfWeek: npDayOfWeek['full'],
        strShortDayOfWeek: npDayOfWeek['short'],
        strMinDayOfWeek: npDayOfWeek['min'],
        totalDaysInMonth: this.getNepaliNumber(totalDays)
      },
      en: {
        year: bs_date.year,
        month: bs_date.month,
        day: bs_date.day,
        strMonth: this.en.monthsName[bs_date.month - 1],
        strShortMonth: this.en.monthsShortName[bs_date.month - 1],
        dayOfWeek,
        strDayOfWeek: enDayOfWeek['full'],
        strShortDayOfWeek: enDayOfWeek['short'],
        strMinDayOfWeek: enDayOfWeek['min'],
        totalDaysInMonth: totalDays
      }
    }
    return dateObj;
  }

  offsetADDays(dayCount) {
    const date = new Date(this.base_ad.year, this.base_ad.month - 1, this.base_ad.day);
    date.setDate(date.getDate() + dayCount);
    const month = date.getMonth(),
        dayOfWeek = date.getDay();
    const dateObj = {
      year: date.getFullYear(),
      month: month + 1,
      strMonth: this.engMonthsName[month],
      strShortMonth: this.engMonthsShortName[month],
      day: date.getDate(),
      dayOfWeek,
      strDayOfWeek: this.engDaysName[dayOfWeek],
      strShortDayOfWeek: this.engDaysShortName[dayOfWeek]
    }
    return dateObj;
  }

  bs2ad(date) {
    return this.offsetADDays(this.countBSDays(date));
  }
  ad2bs(date) {
    return this.offsetBSDays(this.countADDays(date));
  }

}
// Example
// const date = new NepaliDateConverterService();
// console.log(date.ad2bs('2020/7/9'));
// console.log(date.bs2ad('2077/3/20'));