/*******************************************************************************
* Breakout Cave Survey Visualizer
*
* Copyright (C) 2014 James Edwards
*
* jedwards8 at fastmail dot fm
*
* 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 2 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, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*******************************************************************************/
package org.andork.date;
import java.util.Calendar;
public class DateUtils {
public static long daysSinceTheJesus(Calendar cal) {
long year = cal.get(Calendar.YEAR);
long dayOfYear = cal.get(Calendar.DAY_OF_YEAR);
return year * 365
+ (year + 3) / 4
- (year + 99) / 100
+ (year + 399) / 400
+ dayOfYear - 1;
}
}