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<?php |
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declare(strict_types=1); |
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5
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namespace leetcode; |
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7
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class DayOfTheWeek |
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{ |
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public static function dayOfTheWeek(int $day, int $month, int $year): string |
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{ |
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if (empty($day) || empty($month) || empty($year)) { |
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return ''; |
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} |
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$isLeapYear = static function (int $x): bool { |
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return ($x % 400 === 0) || ($x % 4 === 0 && $x % 100 !== 0); |
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}; |
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$days = -1; // Start from 1971-01-01, remove that day. |
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$weeks = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']; |
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$months = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]; |
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for ($i = 1971; $i < $year; $i++) { |
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$day += $isLeapYear($i) ? 366 : 365; |
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} |
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$months[1] = $isLeapYear($year) ? 29 : $months[1]; |
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$days += array_sum(array_slice($months, 0, $month - 1)) + $day; |
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return $weeks[(5 + $days) % 7]; // // Because it was Friday in 1971/1/1. |
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} |
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public static function dayOfTheWeek2(int $day, int $month, int $year): string |
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{ |
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if (empty($day) || empty($month) || empty($year)) { |
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return ''; |
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} |
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$weeks = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']; |
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return $weeks[date('w', strtotime("{$year}-{$month}-{$day}"))]; |
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} |
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} |
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imajinyun /
leetcode-php
