Computes the eastern sunday for the given year. - Java java.util

Java examples for java.util:Day

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Description

Computes the eastern sunday for the given year.

Demo Code

/**/*from  w w  w.j  a v  a 2s . c o m*/
 * The MIT License
 *
 * Copyright (C) 2007 Asterios Raptis
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class Main{
    public static void main(String[] argv) throws Exception{
        int year = 2;
        System.out.println(computeEasternSunday(year));
    }
    /**
     * Computes the eastern sunday for the given year. Year should be greater than 1583.
     *
     * @param year
     *            The year to compute the eastern sunday.
     * @return The eastern sunday.
     */
    public static Date computeEasternSunday(final int year) {

        final int easternSundayNumber = computeEasternSundayNumber(year);
        final int month = easternSundayNumber / 31;
        final int day = easternSundayNumber % 31 + 1;

        return CreateDateUtils.newDate(year, month - 1, day);
    }
    /**
     * Computes the number from eastern sunday for the given year. Year should be greater the 1583.
     *
     * @param year
     *            The year to compute the number from eastern sunday.
     * @return The number from eastern sunday.
     */
    public static int computeEasternSundayNumber(final int year) {
        final int i = year % 19;
        final int j = year / 100;
        final int k = year % 100;
        final int l = (19 * i + j - j / 4 - (j - (j + 8) / 25 + 1) / 3 + 15) % 30;
        final int m = (32 + 2 * (j % 4) + 2 * (k / 4) - l - k % 4) % 7;
        final int n = l + m - 7 * ((i + 11 * l + 22 * m) / 451) + 114;
        return n;
    }
}

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