Java Date Compare by Month isSameMonth(Date date1, Date date2)

Description

is Same Month

License

Open Source License

Declaration

public static boolean isSameMonth(Date date1, Date date2) 

Method Source Code

//package com.java2s;
/*/*from  w ww. j  av  a 2  s.  co  m*/
Copyright (c) 2012,2013 Mirco Attocchi
       
This file is part of WebAppCommon.
    
WebAppCommon 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 3 of the License, or
(at your option) any later version.
    
WebAppCommon 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 WebAppCommon.  If not, see <http://www.gnu.org/licenses/>.
 */

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

public class Main {
    public static boolean isSameMonth(Date date1, Date date2) {
        if (date1 == null || date2 == null) {
            throw new IllegalArgumentException("The dates must not be null");
        }
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);
        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        return isSameDay(cal1, cal2);
    }

    public static boolean isSameMonth(Calendar cal1, Calendar cal2) {
        if (cal1 == null || cal2 == null) {
            throw new IllegalArgumentException("The dates must not be null");
        }
        return (cal1.get(Calendar.ERA) == cal2.get(Calendar.ERA)
                && cal1.get(Calendar.YEAR) == cal2.get(Calendar.YEAR)
                && cal1.get(Calendar.MONTH) == cal2.get(Calendar.MONTH));
    }

    /**
     * <p>
     * Checks if two calendars represent the same day ignoring time.
     * </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>
     */
    public static boolean isSameDay(Calendar cal1, Calendar cal2) {
        if (cal1 == null || cal2 == null) {
            throw new IllegalArgumentException("The dates 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 dates are on the same day ignoring time.
     * </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>
     */
    public static boolean isSameDay(Date date1, Date date2) {
        //      if (date1 == null || date2 == null) {
        //         throw new IllegalArgumentException("The dates must not be null");
        //      }
        if (date1 == null || date2 == null) {
            return false;
        }

        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);
        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        return isSameDay(cal1, cal2);
    }
}

Related

1. isSameMonth(Date date1, Date date2)
2. isSameMonth(final Date d1, final Date d2)
3. isSameMonth(final Date date1, final Date date2)
4. monthsBetween(Date firstDate, Date secondDate)
5. monthsBetween(final Date von, final Date bis)