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DaylightSavingTime.php
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DaylightSavingTime.php
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<?php
declare(strict_types = 1);
/**
* This file is part of the 'Yasumi' package.
*
* The easy PHP Library for calculating holidays.
*
* Copyright (c) 2015 - 2024 AzuyaLabs
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @author Sacha Telgenhof <me at sachatelgenhof dot com>
*/
namespace Yasumi\tests\Denmark;
use Yasumi\tests\HolidayTestCase;
abstract class DaylightSavingTime extends DenmarkBaseTestCase implements HolidayTestCase
{
/** @var int[] */
public array $observedYears;
/** @var int[] */
public array $unobservedYears;
public function __construct()
{
$observedYears = [1916, 1940];
$observedYears = [...$observedYears, ...range(1942, 1948)];
$observedYears = array_merge($observedYears, range(1980, 2037)); // PHP caps future DST transitions
$this->observedYears = $observedYears;
$this->unobservedYears = array_diff(range(reset($observedYears), end($observedYears)), $observedYears);
parent::__construct();
}
/* Swaps the observation from observed to unobserved for the given years */
protected function swapObservation(array $years): void
{
foreach ($years as $y) {
$this->observedYears[] = $y;
if (false !== ($key = array_search($y, $this->unobservedYears, true))) {
unset($this->unobservedYears[(int) $key]);
}
}
}
}