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Date converter is a java library that converts the date in A.D. to B.S. and vice versa
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package com.github.binodnme.dateconverter.utils;

import com.github.binodnme.dateconverter.data.Data;
import java.util.List;

/**
 * Created by binodnme
 * Created on 4/9/16
 */
public class CalendarBS {
  public static final int BAISAKH = 0;
  public static final int JESTHA = 1;
  public static final int ASAR = 2;
  public static final int SHRAWAN = 3;
  public static final int BHADRA = 4;
  public static final int ASOJ = 5;
  public static final int KARTIK = 6;
  public static final int MANGSHIR = 7;
  public static final int POUSH = 8;
  public static final int MAGH = 9;
  public static final int FALGUN = 10;
  public static final int CHAITRA = 11;

  private CalendarBS(){}

  /**
   * get number of days in given year and month
   * index of month starts from 0 i.e index of BAISAKH is 0 and so on
   * @param year year
   * @param monthIndex index of month
   * @return number of days in given year and month
     */
  public static int getDaysInMonth(int year, int monthIndex) {
    List monthsDataInGivenYear = Data.data.get(year);

    if (null != monthsDataInGivenYear) {
      Integer monthData = monthsDataInGivenYear.get(monthIndex);
      if (monthData != null) {
        return monthData;
      } else {
        throw new IndexOutOfBoundsException("month index out of range");
      }
    } else {
      throw new NullPointerException("cannot find the data of year " + year);
    }
  }

  /**
   * adds days in given {@link DateBS}
   * @param dateBS input {@link DateBS}
   * @param days total days to add
   * @return final {@link DateBS} after adding given days in input {@link DateBS}
     */
  public static DateBS addXDays(DateBS dateBS, int days) {
    if (dateBS == null || days < 0)
      return null;

    int delta = days;
    int currentYear = dateBS.getYear();
    int currentMonth = dateBS.getMonth();
    int currentDay = dateBS.getDay();

    do {
      int totalDaysInCurrentMonth = Data.data.get(currentYear).get(currentMonth);
      int daysRemainingInCurrentMonth = totalDaysInCurrentMonth - currentDay;

      if (delta <= daysRemainingInCurrentMonth) {
        currentDay += delta;
        delta = 0;
      } else {
        currentDay = 1;
        delta -= (daysRemainingInCurrentMonth + 1);

        if (currentMonth == CHAITRA) {
          currentMonth = BAISAKH;
          currentYear += 1;
        } else {
          currentMonth += 1;
        }
      }
    } while (delta > 0);

    return new DateBS(currentYear, currentMonth, currentDay);
  }

  /**
   * return the days between input dates
   * @param startDate start date
   * @param endDate end date
   * @return days between start and end date
     */
  public static int daysBetween(DateBS startDate, DateBS endDate) {
    DateBS tempStartDate;
    DateBS tempEndDate;
    int multipleFactor = 1;

    int compareResult = startDate.compareTo(endDate);

    if (compareResult < 0) {
      tempStartDate = startDate;
      tempEndDate = endDate;
    } else if (compareResult > 0) {
      tempStartDate = endDate;
      tempEndDate = startDate;
      multipleFactor = -1;
    } else {
      return 0;
    }

    int totalDays = 0;
    int year = tempStartDate.getYear();
    int month = tempStartDate.getMonth();

    while (!((year == tempEndDate.getYear()) && (month == tempEndDate.getMonth()))) {
      if (month == CHAITRA) {
        totalDays += Data.data.get(year).get(month);
        year++;
        month = BAISAKH;
      } else {
        totalDays += Data.data.get(year).get(month);
        month++;
      }
    }
    totalDays += (tempEndDate.getDay() - tempStartDate.getDay());
    return totalDays * multipleFactor;
  }
}