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<?php |
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declare(strict_types=1); |
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/** |
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* Copyright (c) Andreas Heigl<[email protected]> |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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* |
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* @author Andreas Heigl<[email protected]> |
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* @copyright Andreas Heigl |
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* @license http://www.opensource.org/licenses/mit-license.php MIT-License |
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* @since 08.03.2017 |
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* @link http://github.com/heiglandreas/org.heigl.Holidaychecker |
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*/ |
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namespace Org_Heigl\Holidaychecker\IteratorItem; |
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use DateInterval; |
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use DateTimeImmutable; |
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use function jdtounix; |
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use function jewishtojd; |
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use function juliantojd; |
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class EasterOrthodox extends Easter |
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{ |
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protected function getEaster(int $year): DateTimeImmutable |
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{ |
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$jewishYear = 3760 + $year; |
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$endOfPessach = new DateTimeImmutable( |
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'@' . jdtounix(jewishtojd(1, 20, $jewishYear)) |
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); |
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$orthodoxEaster = $this->getOrthodoxEaster($year); |
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if ($endOfPessach > $orthodoxEaster) { |
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$weekday = (int) $endOfPessach->format('w'); |
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return $endOfPessach->add(new DateInterval('P' . (7 - $weekday) . 'D')); |
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} |
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return $orthodoxEaster; |
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} |
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/** |
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* @param int $year |
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* |
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* @return DateTimeImmutable |
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* @see http://www.smart.net/~mmontes/ortheast.html |
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*/ |
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private function getOrthodoxEaster(int $year): DateTimeImmutable |
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{ |
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$r1 = $year % 19; |
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$r2 = $year % 4; |
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$r3 = $year % 7; |
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$rA = 19 * $r1 + 16; |
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$r4 = $rA % 30; |
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$rB = 2 * $r2 + 4 * $r3 + 6 * $r4; |
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$r5 = $rB % 7; |
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$rC = $r4 + $r5; |
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// Don't touch this. It just seems to work… |
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// And doing the "same" in DateTime (adding a period of $rC days doesn't |
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// yield the same result… |
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return new DateTimeImmutable('@' . jdtounix(juliantojd(3, 21, $year) + $rC)); |
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} |
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} |
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