Java Day End deltaInDays(Date start, Date end)

Description

Get the difference in number of days between the specified dates.

License

Open Source License

Parameter

Parameter	Description
start	a parameter
end	a parameter

Declaration

public static int deltaInDays(Date start, Date end) 

Method Source Code

//package com.java2s;
/*//from   w ww.  j a  v  a 2s  . co m
 * DomUI Java User Interface - shared code
 * Copyright (c) 2010 by Frits Jalvingh, Itris B.V.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * See the "sponsors" file for a list of supporters.
 *
 * The latest version of DomUI and related code, support and documentation
 * can be found at http://www.domui.org/
 * The contact for the project is Frits Jalvingh <jal@etc.to>.
 */

import java.util.Calendar;

import java.util.Date;

public class Main {
    /**
     * Get the difference in number of days between the specified dates.
     * @param start
     * @param end
     * @return
     */
    public static int deltaInDays(Date start, Date end) {
        Calendar startCal = Calendar.getInstance();
        startCal.setTime(start);
        Calendar endCal = Calendar.getInstance();
        endCal.setTime(end);

        clearTime(startCal);
        clearTime(endCal);

        long endL = endCal.getTimeInMillis() + endCal.getTimeZone().getOffset(endCal.getTimeInMillis());
        long startL = startCal.getTimeInMillis() + startCal.getTimeZone().getOffset(startCal.getTimeInMillis());
        return (int) ((double) (endL - startL) / (double) (1000 * 60 * 60 * 24));
    }

    static public void setTime(Calendar cal, int h, int m, int s, int ms) {
        cal.set(Calendar.HOUR_OF_DAY, h);
        cal.set(Calendar.MINUTE, m);
        cal.set(Calendar.SECOND, s);
        cal.set(Calendar.MILLISECOND, ms);
    }

    /**
     * Clears the entire time portion of a Calendar.
     * @param cal
     */
    static public void clearTime(Calendar cal) {
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
    }
}

Related

1. dayBetweenTwoDates(Date beginDate, Date endDate)
2. dayEnd(Date dt)
3. dayEnd(final Date date)
4. daysOfTwoDate(Date beginDate, Date endDate)
5. dayValue(Date date, boolean startEnd)
6. deltaMonths(Date start, Date end)
7. divMonth(Date startDate, Date enDate)
8. endOfDay(Date aDate)
9. endOfDay(Date aDate)