Java Calendar Week truncateToWeek(GregorianCalendar date)

Description

Truncate the given GregorianCalendar date to the nearest week.

License

Apache License

Parameter

Parameter	Description
date	A GregorianCalendar object.

Return

A copy of the same value, truncated to the nearest Monday.

Declaration

public static GregorianCalendar truncateToWeek(GregorianCalendar date) 

Method Source Code

//package com.java2s;
/*//from w w w. j a  v  a2 s . c om
 * 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.GregorianCalendar;

public class Main {
    /**
     * Truncate the given GregorianCalendar date to the nearest week. This is done by
     * cloning it and rounding the value down to the closest Monday. If the given date
     * already occurs on a Monday, a copy of the same date is returned.
     * 
     * @param   date    A GregorianCalendar object.
     * @return          A copy of the same value, truncated to the nearest Monday.
     */
    public static GregorianCalendar truncateToWeek(GregorianCalendar date) {
        // Round the date down to the MONDAY of the same week.
        GregorianCalendar result = (GregorianCalendar) date.clone();
        switch (result.get(Calendar.DAY_OF_WEEK)) {
        case Calendar.TUESDAY:
            result.add(Calendar.DAY_OF_MONTH, -1);
            break;
        case Calendar.WEDNESDAY:
            result.add(Calendar.DAY_OF_MONTH, -2);
            break;
        case Calendar.THURSDAY:
            result.add(Calendar.DAY_OF_MONTH, -3);
            break;
        case Calendar.FRIDAY:
            result.add(Calendar.DAY_OF_MONTH, -4);
            break;
        case Calendar.SATURDAY:
            result.add(Calendar.DAY_OF_MONTH, -5);
            break;
        case Calendar.SUNDAY:
            result.add(Calendar.DAY_OF_MONTH, -6);
            break;
        default:
            break;
        }
        return result;
    }
}

Related

1. isWeekend(GregorianCalendar date)
2. lastDayOfWeek(Calendar cal)
3. lastDayOfWeek(Calendar calendar)
4. setStartOfWeek(Calendar date)
5. setTimeAsFirstDayOfWeek(Calendar calendar)
6. weekDay(Calendar date)
7. weekFloor(Calendar calendar)
8. weekFromBinStart(Calendar date)