com.github.binodnme.dateconverter.converter.DateConverter Maven / Gradle / Ivy

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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.converter;

import com.github.binodnme.dateconverter.utils.CalendarBS;
import com.github.binodnme.dateconverter.utils.DateBS;
import org.joda.time.DateTime;
import org.joda.time.Days;

import java.util.Calendar;
import java.util.Date;

/**
 * Created by binodnme
 * Created on 4/9/16
 */
public class DateConverter {

  private DateConverter(){}

  private static Date getReferenceAD() {
    Calendar calendar = Calendar.getInstance();
    calendar.set(1943, Calendar.APRIL, 14, 0, 0, 0);
    return calendar.getTime();
  }

  private static DateBS getReferenceBS() {
    return new DateBS(2000, CalendarBS.BAISAKH, 1);
  }

  /**
   * converts {@link Date} to corresponding {@link DateBS}
   * @param date {@link Date}
   * @return date in BS
     */
  public static DateBS convertADToBS(Date date) {
    DateTime startDate = new DateTime(getReferenceAD());
    DateTime endDate = new DateTime(date);

    int daysBetween = Days.daysBetween(startDate, endDate).getDays();

    if (daysBetween < 0)
      return null;

    return CalendarBS.addXDays(getReferenceBS(), daysBetween);
  }

  /**
   * converts {@link DateBS} to corresponding {@link Date}
   * @param date {@link DateBS}
   * @return date in AD
     */
  public static Date convertBSToAD(DateBS date) {
    DateBS startDate = getReferenceBS();
    int days = CalendarBS.daysBetween(startDate, date);
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(getReferenceAD());
    calendar.set(Calendar.MILLISECOND, 0);
    calendar.add(Calendar.DATE, days);
    return calendar.getTime();
  }
}