Add support for Swedish holidays (#199)

* Add support for Swedish holidays

* Remove timezones

src/Countries/Sweden.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Sweden extends Country
+{
+    public function countryCode(): string
+    {
+        return 'se';
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'Nyårsdagen' => '01-01',
+            'Trettondedag jul' => '01-06',
+            'Första maj' => '05-1',
+            'Nationaldagen' => '06-6',
+            'Juldagen' => '12-25',
+            'Annandag jul' => '12-26',
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = $this->easter($year);
+
+        /** @var CarbonImmutable $midsummerDay */
+        $midsummerDay = CarbonImmutable::createFromFormat('Y-m-d', "{$year}-06-20");
+
+        if (! $midsummerDay->isSaturday()) {
+            $midsummerDay = $midsummerDay->next(CarbonImmutable::SATURDAY);
+        }
+
+        /** @var CarbonImmutable $halloween */
+        $halloween = CarbonImmutable::createFromFormat('Y-m-d', "{$year}-10-31");
+
+        if (! $halloween->isSaturday()) {
+            $halloween = $halloween->next(CarbonImmutable::SATURDAY);
+        }
+
+        return [
+            'Långfredagen' => $easter->subDays(2),
+            'Påskdagen' => $easter,
+            'Annandag påsk' => $easter->addDay(),
+            'Kristi himmelsfärdsdag' => $easter->addDays(39),
+            'Pingstdagen' => $easter->addDays(49),
+            'Midsommardagen' => $midsummerDay->day > 26
+                ? $midsummerDay->subWeek()
+                : $midsummerDay,
+            'Alla helgons dag' => $halloween,
+        ];
+    }
+}

tests/.pest/snapshots/Countries/SwedenTest/it_can_calculate_swedish_holidays.snap

@@ -0,0 +1,54 @@
+[
+    {
+        "name": "Ny\u00e5rsdagen",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Trettondedag jul",
+        "date": "2024-01-06"
+    },
+    {
+        "name": "L\u00e5ngfredagen",
+        "date": "2024-03-29"
+    },
+    {
+        "name": "P\u00e5skdagen",
+        "date": "2024-03-31"
+    },
+    {
+        "name": "Annandag p\u00e5sk",
+        "date": "2024-04-01"
+    },
+    {
+        "name": "F\u00f6rsta maj",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Kristi himmelsf\u00e4rdsdag",
+        "date": "2024-05-09"
+    },
+    {
+        "name": "Pingstdagen",
+        "date": "2024-05-19"
+    },
+    {
+        "name": "Nationaldagen",
+        "date": "2024-06-06"
+    },
+    {
+        "name": "Midsommardagen",
+        "date": "2024-06-22"
+    },
+    {
+        "name": "Alla helgons dag",
+        "date": "2024-11-02"
+    },
+    {
+        "name": "Juldagen",
+        "date": "2024-12-25"
+    },
+    {
+        "name": "Annandag jul",
+        "date": "2024-12-26"
+    }
+]

tests/Countries/SwedenTest.php

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