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<?php
// Classes for Gedcom Date/Calendar functionality.
//
// Definitions for the Julian Proleptic calendar
// (Proleptic means we extend it backwards, prior to its introduction in 46BC)
//
// NOTE: Since different calendars start their days at different times, (civil
// midnight, solar midnight, sunset, sunrise, etc.), we convert on the basis of
// midday.
//
// webtrees: Web based Family History software
// Copyright (C) 2011 webtrees development team.
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// @author Greg Roach
// @version $Id$
if (!defined('WT_WEBTREES')) {
header('HTTP/1.0 403 Forbidden');
exit;
}
class WT_Date_Julian extends WT_Date_Calendar {
var $new_old_style=false;
static function CALENDAR_ESCAPE() {
return '@#DJULIAN@';
}
static function NextYear($y) {
if ($y==-1)
return 1;
else
return $y+1;
}
function IsLeapYear() {
return $this->y%4==0;
}
static function YMDtoJD($y, $m, $d) {
if ($y<0) // 0=1BC, -1=2BC, etc.
++$y;
$a=floor((14-$m)/12);
$y=$y+4800-$a;
$m=$m+12*$a-3;
return $d+floor((153*$m+2)/5)+365*$y+floor($y/4)-32083;
}
static function JDtoYMD($j) {
$c=$j+32082;
$d=floor((4*$c+3)/1461);
$e=$c-floor(1461*$d/4);
$m=floor((5*$e+2)/153);
$day=$e-floor((153*$m+2)/5)+1;
$month=$m+3-12*floor($m/10);
$year=$d-4800+floor($m/10);
if ($year<1) // 0=1BC, -1=2BC, etc.
--$year;
return array($year, $month, $day);
}
// Process new-style/old-style years and years BC
function ExtractYear($year) {
if (preg_match('/^(\d\d\d\d) \/ \d{1,4}$/', $year, $match)) { // Assume the first year is correct
$this->new_old_style=true;
return $match[1]+1;
} else
if (preg_match('/^(\d+) b ?c$/', $year, $match))
return -$match[1];
else
return (int)$year;
}
function FormatLongYear() {
if ($this->y<0) {
// I18N: Number of years "before christ"
return i18n::translate('%d B.C.', -$this->y);
} else {
if ($this->new_old_style) {
return sprintf('%d/%02d', $this->y-1, $this->y % 100);
} else
return $this->y;
}
}
function FormatGedcomYear() {
if ($this->y<0)
return sprintf('%04dB.C.', -$this->y);
else
if ($this->new_old_style) {
return sprintf('%04d/%02d', $this->y-1, $this->y % 100);
} else
return sprintf('%04d', $this->y);
}
}
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