Java Date Compare by Day isSameDay(Date date1, Date date2)

Description

Checks if two date objects are on the same day ignoring time.

28 Mar 2002 13:45 and 28 Mar 2002 06:01 would return true.

License

Open Source License

Parameter

Parameter	Description
date1	the first date, not altered, not null
date2	the second date, not altered, not null

Exception

Parameter	Description
IllegalArgumentException	if either date is <code>null</code>

Return

true if they represent the same day

Declaration

public static boolean isSameDay(Date date1, Date date2) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2011 MadRobot./*from   w  ww .  j  a  va  2s.  co m*/
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * Contributors:
 *  Elton Kent - initial API and implementation
 ******************************************************************************/

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

public class Main {
    /**
     * <p>Checks if two calendar objects are on the same day ignoring time.</p>
     *
     * <p>28 Mar 2002 13:45 and 28 Mar 2002 06:01 would return true.
     * 28 Mar 2002 13:45 and 12 Mar 2002 13:45 would return false.
     * </p>
     * 
     * @param cal1  the first calendar, not altered, not null
     * @param cal2  the second calendar, not altered, not null
     * @return true if they represent the same day
     * @throws IllegalArgumentException if either calendar is <code>null</code>
     * @since 2.1
     */
    public static boolean isSameDay(Calendar cal1, Calendar cal2) {
        if (cal1 == null || cal2 == null) {
            throw new IllegalArgumentException("The date must not be null");
        }
        return (cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA)
                && cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR)
                && cal1.get(Calendar.DAY_OF_YEAR) == cal2.get(Calendar.DAY_OF_YEAR));
    }

    /**
     * <p>Checks if two date objects are on the same day ignoring time.</p>
     *
     * <p>28 Mar 2002 13:45 and 28 Mar 2002 06:01 would return true.
     * 28 Mar 2002 13:45 and 12 Mar 2002 13:45 would return false.
     * </p>
     * 
     * @param date1  the first date, not altered, not null
     * @param date2  the second date, not altered, not null
     * @return true if they represent the same day
     * @throws IllegalArgumentException if either date is <code>null</code>
     * @since 2.1
     */
    public static boolean isSameDay(Date date1, Date date2) {
        if (date1 == null || date2 == null) {
            throw new IllegalArgumentException("The date must not be null");
        }
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);
        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        return isSameDay(cal1, cal2);
    }
}

Related

1. isSameDay(Date d1, Date d2)
2. isSameDay(Date d1, Date d2)
3. isSameDay(Date date)
4. isSameDay(Date date1, Date date2)
5. isSameDay(Date date1, Date date2)
6. isSameDay(Date day1, Date day2)
7. isSameDay(Date lastUpgradeTime)
8. isSameDay(final Date date1, final Date date2)
9. isSameDayWithToday(Date date)