Android Calendar Interval Get daysBetween(Calendar startDate, Calendar endDate)

Description

days Between

Declaration

public static int daysBetween(Calendar startDate, Calendar endDate) 

Method Source Code

//package com.java2s;
import java.util.Calendar;

public class Main {
    public static int daysBetween(Calendar startDate, Calendar endDate) {
        boolean negative = false;
        if (startDate.after(endDate)) {
            Calendar c = startDate;
            startDate = endDate;//from w ww.ja  v a  2 s  .c om
            endDate = c;
            negative = true;
        }

        int MILLIS_IN_DAY = 1000 * 60 * 60 * 24;
        long endInstant = endDate.getTimeInMillis();
        int presumedDays = (int) ((endInstant - startDate.getTimeInMillis()) / MILLIS_IN_DAY);
        Calendar cursor = (Calendar) startDate.clone();
        cursor.add(Calendar.DAY_OF_YEAR, presumedDays);
        long instant = cursor.getTimeInMillis();
        if (instant == endInstant)
            return presumedDays;

        final int step = instant < endInstant ? 1 : -1;
        do {
            cursor.add(Calendar.DAY_OF_MONTH, step);
            presumedDays += step;
        } while (cursor.getTimeInMillis() != endInstant);

        if (negative) {
            presumedDays = -presumedDays;
        }

        return presumedDays;
    }
}

Related

1. before(Calendar c, long offset)
2. yearsBetweenDates(Calendar from, Calendar to)
3. getExactDiff(final Calendar cal1, final Calendar cal2)