Java Day Between calculateDifference(Date d1, Date d2)

Description

calculate Difference

License

Open Source License

Declaration

public static String calculateDifference(Date d1, Date d2) 

Method Source Code

//package com.java2s;

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

public class Main {
    public static String calculateDifference(Date d1, Date d2) {

        Calendar startDate = Calendar.getInstance();
        Calendar endDate = Calendar.getInstance();

        startDate.clear();/*  w  w w  .j  a v  a2 s  .  com*/
        endDate.clear();

        startDate.setTime(d1);
        endDate.setTime(d2);

        if ((startDate == null) || (endDate == null) || startDate.after(endDate)) {
            return "";
        }

        int yearDiff = endDate.get(Calendar.YEAR) - startDate.get(Calendar.YEAR);

        boolean bYearAdjusted = false;
        startDate.add(Calendar.YEAR, yearDiff);
        if (startDate.after(endDate)) {
            bYearAdjusted = true;
            startDate.add(Calendar.YEAR, -1);
            yearDiff--;
        }

        int monthDiff = endDate.get(Calendar.MONTH) - startDate.get(Calendar.MONTH);
        if (bYearAdjusted && (monthDiff <= 0)) {
            monthDiff = 12 + monthDiff;
        }

        startDate.add(Calendar.MONTH, monthDiff);
        if (startDate.after(endDate)) {
            startDate.add(Calendar.MONTH, -1);
            monthDiff--;
        }

        int dayDiff = endDate.get(Calendar.DAY_OF_YEAR) - startDate.get(Calendar.DAY_OF_YEAR);
        if (dayDiff < 0) {
            dayDiff = 365 + dayDiff;
        }

        startDate.add(Calendar.DAY_OF_YEAR, dayDiff);
        StringBuffer buffer = new StringBuffer();
        if (yearDiff > 0) {
            buffer.append(yearDiff).append(" Year(s), ");
            buffer.append(monthDiff).append(" Month(s), ");
        } else if (monthDiff > 0) {
            buffer.append(monthDiff).append(" Month(s), ");
        }

        buffer.append(dayDiff).append(" Day(s)");
        return buffer.toString();
    }

    public static String toString(String str, char separator, int radix) {
        byte[] value = str.getBytes();
        int digits = (int) (Math.round((float) Math.log(256) / Math.log(radix)));
        StringBuffer buf = new StringBuffer(value.length * (digits + 1));
        for (int i = 0; i < value.length; i++) {
            if (i > 0) {
                buf.append(separator);
            }
            int v = (value[i] & 0xFF);
            String val = Integer.toString(v, radix);
            for (int j = 0; j < digits - val.length(); j++) {
                buf.append('0');
            }
            buf.append(val);
        }
        return buf.toString();
    }
}

Related

1. calculateDayDifference(final Date a, final Date b)
2. calculateDays(Date beginDate, Date endDate)
3. calculateDays(Date dateEarly, Date dateLater)
4. calculateDifferMonths(Date date1, Date date2, boolean isTruncate)
5. calculateNumberOfDays(String dateStr)
6. countDiffDay(String beginDateBase, String endDateBase)
7. dayDiff(Date d1, Date d2)