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<?php
/**
* webtrees: online genealogy
* Copyright (C) 2026 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 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 <https://www.gnu.org/licenses/>.
*/
declare(strict_types=1);
namespace Fisharebest\Webtrees;
use function view;
/**
* The difference between two GEDCOM dates.
*/
class Age
{
private int $years;
private int $months;
private int $days;
private int $total_days;
private bool $is_exact;
private bool $is_valid;
/**
* @param Date $x The first date
* @param Date $y The second date
*/
public function __construct(Date $x, Date $y)
{
// If the dates are ranges, use the start/end calendar dates.
$start = $x->minimumDate();
$end = $y->maximumDate();
[$this->years, $this->months, $this->days] = $start->ageDifference($end);
$this->total_days = $end->minimumJulianDay() - $start->minimumJulianDay();
// Use the same precision as found in the dates.
if ($start->day() === 0 || $end->day() === 0) {
$this->days = 0;
}
if ($start->month() === 0 || $end->month() === 0) {
$this->months = 0;
}
// Are the dates exact?
$this->is_exact = $start->day() !== 0 && $end->day() !== 0;
// Are the dates valid?
$this->is_valid = $x->isOK() && $y->isOK();
}
/**
* Show an age in a human-friendly form, such as "34 years", "8 months", "20 days".
* Show an empty string for invalid/missing dates.
* Show a warning icon for negative ages.
* Show zero ages without any units.
*
* @return string
*/
public function __toString(): string
{
if (!$this->is_valid) {
return '';
}
if ($this->years < 0) {
return view('icons/warning');
}
if ($this->years > 0) {
return I18N::plural('%s year', '%s years', $this->years, I18N::number($this->years));
}
if ($this->months > 0) {
return I18N::plural('%s month', '%s months', $this->months, I18N::number($this->months));
}
if ($this->days > 0 || $this->is_exact) {
return I18N::plural('%s day', '%s days', $this->days, I18N::number($this->days));
}
return I18N::number(0);
}
/**
* How many days between two events?
* If either date is invalid return -1.
*
* @return int
*/
public function ageDays(): int
{
if ($this->is_valid) {
return $this->total_days;
}
return -1;
}
/**
* How many years between two events?
* Return -1 for invalid or reversed dates.
*
* @return int
*/
public function ageYears(): int
{
if ($this->is_valid) {
return $this->years;
}
return -1;
}
/**
* How many years between two events?
* If either date is invalid return -1.
*
* @return string
*/
public function ageYearsString(): string
{
if (!$this->is_valid) {
return '';
}
if ($this->years < 0) {
return view('icons/warning');
}
return I18N::number($this->years);
}
}
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