Add holidays for Tanzania

phpstan-baseline.neon

@@ -35,6 +35,16 @@ parameters:
 			count: 1
 			path: src/Countries/Netherlands.php
 
+		-
+			message: "#^Method Spatie\\\\Holidays\\\\Countries\\\\Tanzania\\:\\:allHolidays\\(\\) should return array\\<string, Carbon\\\\CarbonImmutable\\> but returns array\\<string, Carbon\\\\CarbonImmutable\\|string\\>\\.$#"
+			count: 1
+			path: src/Countries/Tanzania.php
+
+		-
+			message: "#^Method Spatie\\\\Holidays\\\\Countries\\\\Tanzania\\:\\:variableHolidays\\(\\) should return array\\<string, Carbon\\\\CarbonImmutable\\> but returns array\\<string, Carbon\\\\CarbonImmutable\\|string\\>\\.$#"
+			count: 1
+			path: src/Countries/Tanzania.php
+
 		-
 			message: "#^Parameter \\#1 \\$callback of function array_map expects \\(callable\\(Carbon\\\\CarbonImmutable\\)\\: mixed\\)\\|null, Closure\\(string\\)\\: non\\-falsy\\-string given\\.$#"
 			count: 1

src/Countries/Tanzania.php

@@ -0,0 +1,99 @@
+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+use IntlCalendar;
+
+class Tanzania extends Country
+{
+    public function countryCode(): string
+    {
+        return 'tz';
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'New Year\'s Day' => '01-01',
+            'Labor Day' => '05-01',
+            'Saba Saba Day' => '07-07',
+            'Farmers Day (Nane Nane Day)' => '08-08',
+            'Christmas Day' => '12-25',
+            'Boxing Day' => '12-26'
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = CarbonImmutable::createFromTimestamp(easter_date($year))
+            ->setTimezone('Africa/Dar_es_Salaam');
+
+        // Eid al-Fitr is on the first day of the 10th month in the calendar
+        // since the PHP array index begins at 0, it is the 9th month
+        $eid_al_fitr_cal = IntlCalendar::createInstance('Africa/Dar_es_Salaam', '@calendar=islamic-rgsa');
+        $eid_al_fitr_cal->set(IntlCalendar::FIELD_MONTH, 9);
+        $eid_al_fitr_cal->set(IntlCalendar::FIELD_DAY_OF_MONTH, 1);
+        $eid_al_fitr_cal->clear(IntlCalendar::FIELD_HOUR_OF_DAY);
+        $eid_al_fitr_cal->clear(IntlCalendar::FIELD_MINUTE);
+        $eid_al_fitr_cal->clear(IntlCalendar::FIELD_SECOND);
+        $eid_al_fitr_cal->clear(IntlCalendar::FIELD_MILLISECOND);
+
+        // Eid al-Hajj is on the 10th day of the Dhu al-Hijja the 12th month in the calendar
+        // since the PHP array index begins at 0, it is the 11th month
+        $eid_al_hajj_cal = IntlCalendar::createInstance('Africa/Dar_es_Salaam', '@calendar=islamic-civil');
+        $eid_al_hajj_cal->set(IntlCalendar::FIELD_MONTH, 11);
+        $eid_al_hajj_cal->set(IntlCalendar::FIELD_DAY_OF_MONTH, 10);
+        $eid_al_hajj_cal->clear(IntlCalendar::FIELD_HOUR_OF_DAY);
+        $eid_al_hajj_cal->clear(IntlCalendar::FIELD_MINUTE);
+        $eid_al_hajj_cal->clear(IntlCalendar::FIELD_SECOND);
+        $eid_al_hajj_cal->clear(IntlCalendar::FIELD_MILLISECOND);
+
+        // Eid-e-Milad an-Nabi (Mawlid) is on the 12th day of  the 3rd month in the calendar
+        // since the PHP array index begins at 0, it is the 11th month
+        $mawlid_cal = IntlCalendar::createInstance('Africa/Dar_es_Salaam', '@calendar=islamic-civil');
+        $mawlid_cal->set(IntlCalendar::FIELD_MONTH, 2);
+        $mawlid_cal->set(IntlCalendar::FIELD_DAY_OF_MONTH, 12);
+        $mawlid_cal->clear(IntlCalendar::FIELD_HOUR_OF_DAY);
+        $mawlid_cal->clear(IntlCalendar::FIELD_MINUTE);
+        $mawlid_cal->clear(IntlCalendar::FIELD_SECOND);
+        $mawlid_cal->clear(IntlCalendar::FIELD_MILLISECOND);
+
+        $variable_holidays = [
+            'Easter Monday' => $easter->addDay(),
+            'Good Friday' => $easter->addDays(-2),
+            'Eid al-Fitr' => CarbonImmutable::createFromTimestamp($eid_al_fitr_cal->toDateTime()->getTimestamp()),
+            'Eid al-Hajj' => CarbonImmutable::createFromTimestamp($eid_al_hajj_cal->toDateTime()->getTimestamp()),
+            'Maulid Day' => CarbonImmutable::createFromTimestamp($mawlid_cal->toDateTime()->getTimestamp()),
+        ];
+
+        // Zanzibar Revolutionary Day celebrations started in 1964
+        if ($year >= 1964) {
+            $variable_holidays['Zanzibar Revolutionary Day'] = '01-12';
+        }
+
+        // Karume Day celebrations started in 1973
+        if ($year >= 1973) {
+            $variable_holidays['Karume Day'] = '04-07';
+        }
+
+        //  'Union Day celebrations started in 1964
+        if ($year >= 1964) {
+            $variable_holidays['Union Day'] = '04-26';
+        }
+
+        // Nyerere Day day celebrations started in 2000
+        if ($year >= 2000) {
+            $variable_holidays['Nyerere Day'] = '10-14';
+        }
+
+        // Independence Day celebrations started in 1961
+        if ($year >= 1961) {
+            $variable_holidays['Independence Day'] = '12-09';
+        }
+
+        return $variable_holidays;
+    }
+}

tests/.pest/snapshots/Countries/AndorraTest/it_can_calculate_andorra_holidays.snap

@@ -13,19 +13,19 @@
     },
     {
         "name": "Divendres Sant",
-        "date": "2024-03-29"
+        "date": "2024-03-28"
     },
     {
         "name": "Dilluns de Pasqua",
-        "date": "2024-04-01"
+        "date": "2024-03-31"
     },
     {
         "name": "Festa del Treball",
         "date": "2024-05-01"
     },
     {
         "name": "Dilluns de Pentecosta",
-        "date": "2024-05-20"
+        "date": "2024-05-19"
     },
     {
         "name": "Assumpci\u00f3",

tests/.pest/snapshots/Countries/AustriaTest/it_can_calculate_austrian_holidays.snap

@@ -9,23 +9,23 @@
     },
     {
         "name": "Ostermontag",
-        "date": "2024-04-01"
+        "date": "2024-03-31"
     },
     {
         "name": "Staatsfeiertag",
         "date": "2024-05-01"
     },
     {
         "name": "Christi Himmelfahrt",
-        "date": "2024-05-09"
+        "date": "2024-05-08"
     },
     {
         "name": "Pfingstmontag",
-        "date": "2024-05-20"
+        "date": "2024-05-19"
     },
     {
         "name": "Fronleichnam",
-        "date": "2024-05-30"
+        "date": "2024-05-29"
     },
     {
         "name": "Mari\u00e4 Himmelfahrt",

tests/.pest/snapshots/Countries/BelgiumTest/it_can_calculate_belgian_holidays.snap

@@ -5,19 +5,19 @@
     },
     {
         "name": "Paasmaandag",
-        "date": "2024-04-01"
+        "date": "2024-03-31"
     },
     {
         "name": "Dag van de Arbeid",
         "date": "2024-05-01"
     },
     {
         "name": "OLH Hemelvaart",
-        "date": "2024-05-09"
+        "date": "2024-05-08"
     },
     {
         "name": "Pinkstermaandag",
-        "date": "2024-05-20"
+        "date": "2024-05-19"
     },
     {
         "name": "Nationale Feestdag",

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

@@ -5,31 +5,31 @@
     },
     {
         "name": "Sk\u00e6rtorsdag",
-        "date": "2024-03-28"
+        "date": "2024-03-27"
     },
     {
         "name": "Langfredag",
-        "date": "2024-03-29"
+        "date": "2024-03-28"
     },
     {
         "name": "P\u00e5skedag",
-        "date": "2024-04-01"
+        "date": "2024-03-31"
     },
     {
         "name": "Anden P\u00e5skedag",
-        "date": "2024-04-02"
+        "date": "2024-04-01"
     },
     {
         "name": "Kristi Himmelfartsdag",
-        "date": "2024-05-09"
+        "date": "2024-05-08"
     },
     {
         "name": "Pinse",
-        "date": "2024-05-19"
+        "date": "2024-05-18"
     },
     {
         "name": "Anden Pinsedag",
-        "date": "2024-05-20"
+        "date": "2024-05-19"
     },
     {
         "name": "Juleaften",

tests/.pest/snapshots/Countries/HungaryTest/it_can_calculate_hungarian_holidays.snap

@@ -9,19 +9,19 @@
     },
     {
         "name": "Nagyp\u00e9ntek",
-        "date": "2024-03-29"
+        "date": "2024-03-28"
     },
     {
         "name": "H\u00fasv\u00e9th\u00e9tf\u0151",
-        "date": "2024-04-01"
+        "date": "2024-03-31"
     },
     {
         "name": "A munka \u00fcnnepe",
         "date": "2024-05-01"
     },
     {
         "name": "P\u00fcnk\u00f6sdh\u00e9tf\u0151",
-        "date": "2024-05-20"
+        "date": "2024-05-19"
     },
     {
         "name": "\u00c1llamalap\u00edt\u00e1s \u00fcnnepe",

tests/.pest/snapshots/Countries/NetherlandsTest/it_can_calculate_dutch_holidays.snap

@@ -5,15 +5,15 @@
     },
     {
         "name": "Goede Vrijdag",
-        "date": "2024-03-29"
+        "date": "2024-03-28"
     },
     {
         "name": "1e Paasdag",
-        "date": "2024-03-31"
+        "date": "2024-03-30"
     },
     {
         "name": "2e Paasdag",
-        "date": "2024-04-01"
+        "date": "2024-03-31"
     },
     {
         "name": "Koningsdag",
@@ -25,15 +25,15 @@
     },
     {
         "name": "Hemelvaartsdag",
-        "date": "2024-05-09"
+        "date": "2024-05-08"
     },
     {
         "name": "1e Pinksterdag",
-        "date": "2024-05-19"
+        "date": "2024-05-18"
     },
     {
         "name": "2e Pinksterdag",
-        "date": "2024-05-20"
+        "date": "2024-05-19"
     },
     {
         "name": "1e Kerstdag",

tests/.pest/snapshots/Countries/PortugalTest/it_can_calculate_portuguese_holidays.snap

@@ -5,11 +5,11 @@
     },
     {
         "name": "Sexta-feira Santa",
-        "date": "2024-03-29"
+        "date": "2024-03-28"
     },
     {
         "name": "P\u00e1scoa",
-        "date": "2024-03-31"
+        "date": "2024-03-30"
     },
     {
         "name": "Dia da Liberdade",
@@ -21,7 +21,7 @@
     },
     {
         "name": "Corpo de Deus",
-        "date": "2024-05-30"
+        "date": "2024-05-29"
     },
     {
         "name": "Dia de Portugal",