com.liusoft.dlog4j.util.DateUtils.java Source code

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Here is the source code for com.liusoft.dlog4j.util.DateUtils.java

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/*
 *  DateUtils.java
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *  
 *  Author: Winter Lau (javayou@gmail.com)
 *  http://dlog4j.sourceforge.net
 */
package com.liusoft.dlog4j.util;

import java.sql.Time;
import java.util.Calendar;
import java.util.Date;

/**
 * 
 * @author Winter Lau
 */
public class DateUtils extends org.apache.commons.lang.time.DateUtils {

    /**
     * ?
     * @param date
     * @param time
     * @return
     */
    public static Calendar mergeDateTime(Date date, Time time) {
        Calendar cal = Calendar.getInstance();
        if (date != null)
            cal.setTime(date);
        if (time != null) {
            Calendar temp = Calendar.getInstance();
            temp.setTime(time);
            cal.set(Calendar.HOUR_OF_DAY, temp.get(Calendar.HOUR_OF_DAY));
            cal.set(Calendar.MINUTE, temp.get(Calendar.MINUTE));
            cal.set(Calendar.SECOND, temp.get(Calendar.SECOND));
            cal.set(Calendar.MILLISECOND, temp.get(Calendar.MILLISECOND));
        }
        return cal;
    }

    /**
     * 
     * @param d1
     * @param d2
     * @return
     */
    public static int diff_in_date(Date d1, Date d2) {
        return (int) (d1.getTime() - d2.getTime()) / 86400000;
    }

    /**
     * ??
     * @param year
     * @param month
     * @param date
     * @return
     */
    public static Calendar getDateBegin(int year, int month, int date) {
        Calendar begin_time = Calendar.getInstance();
        begin_time.set(Calendar.YEAR, year);
        begin_time.set(Calendar.MONTH, month - 1);
        begin_time.set(Calendar.DATE, date);
        begin_time.set(Calendar.HOUR_OF_DAY, 0);
        begin_time.set(Calendar.MINUTE, 0);
        begin_time.set(Calendar.SECOND, 0);
        begin_time.set(Calendar.MILLISECOND, 0);
        return begin_time;
    }

    /**
     * 
     * @param cal
     */
    public static void resetTime(Calendar cal) {
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
    }

}