Polish holidays

src/Countries/Poland.php

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+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Poland extends Country
+{
+    public function countryCode(): string
+    {
+        return 'pl';
+    }
+
+    /** @return array<string, CarbonImmutable|string> */
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Nowy Rok' => '01-01',
+            'Święto Trzech Króli' => '01-06',
+            'Święto Pracy' => '05-01',
+            'Święto Konstytucji 3 Maja' => '05-03',
+            'Święto Wojska Polskiego, Wniebowzięcie Najświętszej Maryi Panny' => '08-15',
+            'Wszystkich Świętych' => '11-01',
+            'Święto Niepodległości' => '11-11',
+            'Boże Narodzenie' => '12-25',
+            'Drugi Dzień Bożego Narodzenia' => '12-26',
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = CarbonImmutable::createFromTimestamp(easter_date($year))->setTimezone('Europe/Warsaw');
+
+        return [
+            'Wielkanoc' => $easter,
+            'Poniedziałek Wielkanocny' => $easter->addDay(),
+            'Zielone Świątki' => $easter->addWeeks(7),
+            'Boże Ciało' => $easter->addDays(60),
+        ];
+    }
+}

tests/.pest/snapshots/Countries/PolandTest/it_can_calculate_polish_holidays.snap

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+[
+    {
+        "name": "Nowy Rok",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "\u015awi\u0119to Trzech Kr\u00f3li",
+        "date": "2024-01-06"
+    },
+    {
+        "name": "Wielkanoc",
+        "date": "2024-03-31"
+    },
+    {
+        "name": "Poniedzia\u0142ek Wielkanocny",
+        "date": "2024-04-01"
+    },
+    {
+        "name": "\u015awi\u0119to Pracy",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "\u015awi\u0119to Konstytucji 3 Maja",
+        "date": "2024-05-03"
+    },
+    {
+        "name": "Zielone \u015awi\u0105tki",
+        "date": "2024-05-19"
+    },
+    {
+        "name": "Bo\u017ce Cia\u0142o",
+        "date": "2024-05-30"
+    },
+    {
+        "name": "\u015awi\u0119to Wojska Polskiego, Wniebowzi\u0119cie Naj\u015bwi\u0119tszej Maryi Panny",
+        "date": "2024-08-15"
+    },
+    {
+        "name": "Wszystkich \u015awi\u0119tych",
+        "date": "2024-11-01"
+    },
+    {
+        "name": "\u015awi\u0119to Niepodleg\u0142o\u015bci",
+        "date": "2024-11-11"
+    },
+    {
+        "name": "Bo\u017ce Narodzenie",
+        "date": "2024-12-25"
+    },
+    {
+        "name": "Drugi Dzie\u0144 Bo\u017cego Narodzenia",
+        "date": "2024-12-26"
+    }
+]

tests/Countries/PolandTest.php

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+<?php
+
+namespace Spatie\Holidays\Tests\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Holidays;
+
+it('can calculate polish holidays', function () {
+    CarbonImmutable::setTestNowAndTimezone('2024-01-01');
+
+    $holidays = Holidays::for(country: 'pl')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});