Java Calendar Different getTimeDifference(String unit, Calendar start, Calendar end)

Description

get Time Difference

License

Apache License

Declaration

public static long getTimeDifference(String unit, Calendar start, Calendar end) 

Method Source Code

//package com.java2s;
/*/*  www  .  java2s.  c o m*/
 * Copyright (C) 2014 Dell, Inc.
 * 
 * Licensed 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.Calendar;
import java.util.Hashtable;

public class Main {
    final static long ONE_SECOND = 1000;
    final static long ONE_MINUTE = ONE_SECOND * 60;
    final static long ONE_HOUR = ONE_MINUTE * 60;
    final static long ONE_DAY = ONE_HOUR * 24;
    final static long ONE_WEEK = ONE_DAY * 7;
    static Hashtable<String, Integer> functions = new Hashtable<>();

    public static long getTimeDifference(String unit, Calendar start, Calendar end) {

        long diff = end.getTimeInMillis() - start.getTimeInMillis();
        switch (functions.get(unit)) {
        case 20: // minute
            diff = diff / ONE_MINUTE;
            break;
        case 21: //hour
            diff = diff / ONE_HOUR;
            break;
        case 22: //day
            diff = diff / ONE_DAY;
            break;
        case 23: //week
            diff = diff / ONE_WEEK;
            break;
        case 24: //month
            diff = end.get(Calendar.YEAR) - start.get(Calendar.YEAR);
            diff = diff * 12 + end.get(Calendar.MONTH) - start.get(Calendar.MONTH);
            break;
        case 25: //year
            diff = end.get(Calendar.YEAR) - start.get(Calendar.YEAR);
            break;
        case 26: //quarter
            diff = end.get(Calendar.YEAR) - start.get(Calendar.YEAR);
            diff = diff * 12 + end.get(Calendar.MONTH) - start.get(Calendar.MONTH);
            diff = diff / 3;
            break;
        case 27: //second
            diff = diff / ONE_SECOND;
            break;
        default:
            throw new IllegalArgumentException("Unsupported date time unit:" + unit);
        }

        return diff;
    }
}

Related

1. getDiffTargetDate(Calendar cal, int diffDay)
2. getMillisDiff(long lhs, long rhs, int gregorianCalendarUnits)
3. getMonthDiff(Calendar c1, Calendar c2)
4. getMonthsDifference(Calendar date1, Calendar date2)
5. getTargetDate(Calendar reqCal, int diffMon, int proxyDay)
6. getTimeDiffSecond(Calendar first, Calendar second)
7. getWeekDifference(Calendar before, Calendar after)
8. getYearDifference(GregorianCalendar fromCalendar, GregorianCalendar toCalendar)
9. millisDiff(Calendar c1, Calendar c2)