/*
* Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* <http://www.gnu.org/licenses/> or <http://www.apache.org/licenses/LICENSE-2.0>.
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.nutsnbolts.calendar;
public class CalendarUtility {
// year month[1-12] day[1-31] weekday[1-7](SUNDAY-SATURDAY) hour[0-23] minute[0-59]
private static final int[] DAYS_IN_MONTH = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
public static Month getMonth (int month) {
return Month.values()[month - 1];
}
public static Day getDay (int dayOfWeek) {
return Day.values()[dayOfWeek - 1];
}
public static int getDaysInYear (int year) {
return ((year % 4) == 0) ? 366 : 365;
}
public static int getDaysInMonth (int year, int month) {
if (month == 2) {
if ((year % 4) == 0) {
return 29;
}
}
return DAYS_IN_MONTH[month - 1];
}
public static int getDayOfWeek (int year, int month, int day) {
int weekday;
int monthArtifact;
int adjustedYear;
int adjustedMonth;
monthArtifact = (14 - month) / 12;
adjustedYear = year - monthArtifact;
adjustedMonth = (month - 2) + (12 * monthArtifact);
weekday = ((day + adjustedYear + (adjustedYear / 4) - (adjustedYear / 100) + (adjustedYear / 400) + (31 * adjustedMonth / 12)) % 7) + 1;
return weekday;
}
}