Danish holidays

src/Countries/Denmark.php

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+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Denmark extends Country
+{
+    public function countryCode(): string
+    {
+        return 'da';
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Nytår' => '01-01',
+            'Juleaften' => '12-24',
+            'Juledag' => '12-25',
+            'Anden Juledag' => '12-26'
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = CarbonImmutable::createFromTimestamp(easter_date($year))
+            ->setTimezone('Europe/Copenhagen');
+
+        $holidays = [
+            'Påskedag' => $easter->addDay(),
+            'Skærtorsdag' => $easter->subDays(3),
+            'Langfredag' => $easter->subDays(2),
+            'Anden Påskedag' => $easter->addDays(2),
+            'Kristi Himmelfartsdag' => $easter->addDays(39),
+            'Pinse' => $easter->addDays(49),
+            'Anden Pinsedag' => $easter->addDays(50),
+        ];
+
+        if ($year < 2024) {
+            $holidays['Store Bededag'] = $easter->addDays(26);
+        }
+
+        return $holidays;
+    }
+}

tests/.pest/snapshots/Countries/DenmarkTest/it_can_calculate_danish_holidays.snap

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+[
+    {
+        "name": "Nyt\u00e5r",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Sk\u00e6rtorsdag",
+        "date": "2024-03-28"
+    },
+    {
+        "name": "Langfredag",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "P\u00e5skedag",
+        "date": "2024-04-01"
+    },
+    {
+        "name": "Anden P\u00e5skedag",
+        "date": "2024-04-02"
+    },
+    {
+        "name": "Kristi Himmelfartsdag",
+        "date": "2024-05-09"
+    },
+    {
+        "name": "Pinse",
+        "date": "2024-05-19"
+    },
+    {
+        "name": "Anden Pinsedag",
+        "date": "2024-05-20"
+    },
+    {
+        "name": "Juleaften",
+        "date": "2024-12-24"
+    },
+    {
+        "name": "Juledag",
+        "date": "2024-12-25"
+    },
+    {
+        "name": "Anden Juledag",
+        "date": "2024-12-26"
+    }
+]

tests/Countries/DenmarkTest.php

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