Java Day Count getDaysBetween(Calendar d1, Calendar d2)

Description

get Days Between

License

Open Source License

Declaration

public static int getDaysBetween(Calendar d1, Calendar d2) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.text.ParseException;
import java.text.SimpleDateFormat;

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

public class Main {
    public static int getDaysBetween(Calendar d1, Calendar d2) {
        if (d1.after(d2)) { // swap dates so that d1 is start and d2 is end
            Calendar swap = d1;// w ww  . j  a  v  a 2 s  .  co  m
            d1 = d2;
            d2 = swap;
        }
        int days = d2.get(Calendar.DAY_OF_YEAR) - d1.get(Calendar.DAY_OF_YEAR);
        int y2 = d2.get(Calendar.YEAR);
        if (d1.get(Calendar.YEAR) != y2) {
            d1 = (Calendar) d1.clone();
            do {
                days += d1.getActualMaximum(Calendar.DAY_OF_YEAR);
                d1.add(Calendar.YEAR, 1);
            } while (d1.get(Calendar.YEAR) != y2);
        }
        return days;
    }

    public static int getDaysBetween(String beginDate, String endDate) {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        Date bDate = null;
        Date eDate = null;
        try {
            bDate = format.parse(beginDate);
            eDate = format.parse(endDate);
        } catch (ParseException e) {
            return -1;
        }
        Calendar d1 = new GregorianCalendar();
        d1.setTime(bDate);
        Calendar d2 = new GregorianCalendar();
        d2.setTime(eDate);
        int days = d2.get(6) - d1.get(6);
        int y2 = d2.get(1);
        if (d1.get(1) != y2) {
            d1 = (Calendar) d1.clone();
            do {
                days += d1.getActualMaximum(6);
                d1.add(1, 1);
            } while (d1.get(1) != y2);
        }
        return days;
    }
}

Related

1. getDayCount(String from, String to)
2. getDayCount(String from, String to)
3. getDayCount(String yyyy_mm_dd_1, String yyyy_mm_dd_2)
4. getDaySub(String beginDate, String endDate)
5. getDaySub(String start_time, String end_time)
6. getDaysBetween(Map params)
7. getDaysBetweenTwoDays(String dateFrom, String dateEnd)
8. GetDays(String strStartDate, String strEndDate)