Java Calendar Calculate isSameInstant(Calendar cal1, Calendar cal2)

Description

Checks if two calendar objects represent the same instant in time.

This method compares the long millisecond time of the two objects.

License

Apache License

Parameter

Parameter	Description
cal1	the first calendar, not altered, not null
cal2	the second calendar, not altered, not null

Exception

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

Return

true if they represent the same millisecond instant

Declaration

public static boolean isSameInstant(Calendar cal1, Calendar cal2) 

Method Source Code

//package com.java2s;
/*//  ww w .  ja va2  s  . c  om
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.*;

public class Main {
    /**
     * <p>Checks if two date objects represent the same instant in time.</p>
     * <p>
     * <p>This method compares the long millisecond time of the two objects.</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 millisecond instant
     * @throws IllegalArgumentException if either date is <code>null</code>
     * @since 2.1
     */
    public static boolean isSameInstant(Date date1, Date date2) {
        if (date1 == null || date2 == null) {
            throw new IllegalArgumentException("The date must not be null");
        }
        return date1.getTime() == date2.getTime();
    }

    /**
     * <p>Checks if two calendar objects represent the same instant in time.</p>
     * <p>
     * <p>This method compares the long millisecond time of the two objects.</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 millisecond instant
     * @throws IllegalArgumentException if either date is <code>null</code>
     * @since 2.1
     */
    public static boolean isSameInstant(Calendar cal1, Calendar cal2) {
        if (cal1 == null || cal2 == null) {
            throw new IllegalArgumentException("The date must not be null");
        }
        return cal1.getTime().getTime() == cal2.getTime().getTime();
    }
}

Related

1. getTimeStr3(Calendar timeInstance)
2. getTimeString(Calendar cal)
3. getTimeStrWithMillisecond(Calendar timeInstance)
4. isAfterWorkTime(Calendar start)
5. isInWorkTime(Calendar start)
6. isSameLocalTime(Calendar cal1, Calendar cal2)
7. maximizeTime(Calendar cal)
8. millisToCalendar(long millis)
9. normalize(final Calendar cal)