Java Day From firstDayOfCentury(final int century)

Description

first Day Of Century

License

Open Source License

Parameter

Parameter	Description
century	(positive integer)

Declaration

public static Date firstDayOfCentury(final int century) 

Method Source Code

//package com.java2s;
/*/*ww w .  j  a  va 2  s  .  co m*/
 * #%L
 * Webstar Newsletter
 * %%
 * Copyright (C) 2013 Webstar Csoport Kft.
 * %%
 * 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 3 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public 
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #L%
 */

import java.util.*;

public class Main {
    /**
     *
     * @param century (positive integer)
     * @return
     */
    public static Date firstDayOfCentury(final int century) {
        return firstDayOfYear(firstYearOfCentury(century));
    }

    public static Date firstDayOfYear(final int year) {
        return createDate(year, 1, 1);
    }

    /**
     *
     * @param century (positive integer)
     * @return
     */
    public static int firstYearOfCentury(final int century) {
        return (century - 1) * 100 + 1;
    }

    public static Date createDate(int year, int month, int day) {
        Calendar c = new GregorianCalendar();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.MONTH, month - 1);
        c.set(Calendar.DAY_OF_MONTH, day);
        return startOfDay(c.getTime());
    }

    public static Date startOfDay(Date datum) {
        if (datum == null) {
            return null;
        }
        Calendar cal = new GregorianCalendar();
        cal.setTime(datum);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);

        return cal.getTime();
    }
}

Related

1. daysSince(Date since)
2. dayStartTime(int day)
3. distanceToNowInDaysIgnoreTime(Date date)
4. equalsDay(final Date date1, final Date date2)
5. explDay(Date date)
6. get23HourOfDay(Date date)
7. getAge(Date birthDay)
8. getBeforeDate_(Date date, int day)
9. getDateByDay(Date date)