diff --git a/README.rst b/README.rst
index c6bc670d7..dfc8ac832 100644
--- a/README.rst
+++ b/README.rst
@@ -268,7 +268,7 @@ The list of supported countries, their subdivisions and supported languages
    * - Curacao
      - CW
      -
-     -
+     - en_US, nl, **pap**, uk
    * - Cyprus
      - CY
      -
diff --git a/holidays/countries/curacao.py b/holidays/countries/curacao.py
index 5bbb06e6d..b8a10c44b 100644
--- a/holidays/countries/curacao.py
+++ b/holidays/countries/curacao.py
@@ -11,81 +11,135 @@
 
 from datetime import date
 from datetime import timedelta as td
+from gettext import gettext as tr
 
-from dateutil.easter import easter
-
-from holidays.constants import JAN, APR, MAY, JUL, AUG, OCT, DEC
+from holidays.constants import APR, MAY, JUL, OCT
 from holidays.holiday_base import HolidayBase
+from holidays.holiday_groups import ChristianHolidays, InternationalHolidays
 
 
-class Curacao(HolidayBase):
+class Curacao(HolidayBase, ChristianHolidays, InternationalHolidays):
     """
-    https://loketdigital.gobiernu.cw/Loket/product/571960bbe1e5fe8712b10a1323630e70
+    https://loketdigital.gobiernu.cw/Loket/product/571960bbe1e5fe8712b10a1323630e70  # noqa: E501
+    https://en.wikipedia.org/wiki/Public_holidays_in_Cura%C3%A7ao
+
+    New Year's Eve (Vispu di Aña Nobo) is a half-day public holiday, though
+    this isn't supported by Python Holidays so it won't be implemented.
     """
 
     country = "CW"
+    default_language = "pap"
+    supported_languages = ("en_US", "nl", "pap", "uk")
+
+    def __init__(self, *args, **kwargs):
+        ChristianHolidays.__init__(self)
+        InternationalHolidays.__init__(self)
+        super().__init__(*args, **kwargs)
 
     def _populate(self, year):
+        # 1954: Creation of the Netherlands Antilles.
+        if year <= 1953:
+            return None
+
         super()._populate(year)
 
+        # Aña Nobo.
+        # Status: In-Use.
+
         # New Year's Day
-        self[date(year, JAN, 1)] = "Nieuwjaarsdag [New Year's Day]"
+        self._add_new_years_day(tr("Aña Nobo"))
+
+        # Dialuna despues di Carnaval Grandi.
+        # Status: In-Use.
+        # Started in 1947.
+
+        # Carnival Monday
+        self._add_ash_monday(tr("Dialuna despues di Carnaval Grandi"))
 
-        easter_date = easter(year)
-        # Carnaval Monday
-        self[
-            easter_date + td(days=-48)
-        ] = "Maandag na de Grote Karnaval [Carnaval Monday]"
+        # Bièrnèsantu.
+        # Status: In-Use.
 
         # Good Friday
-        self[easter_date + td(days=-2)] = "Goede Vrijdag [Good Friday]"
+        self._add_good_friday(tr("Bièrnèsantu"))
 
-        # Easter Monday
-        self[
-            easter_date + td(days=+1)
-        ] = "Di Dos Dia di Pasku di Resureccion [Easter Monday]"
+        # Pasku di Resurekshon.
+        # Status: In-Use
 
-        # King's Day
-        if year >= 2014:
-            kings_day = date(year, APR, 27)
-            if self._is_sunday(kings_day):
-                kings_day += td(days=-1)
+        # Easter Sunday
+        self._add_easter_sunday(tr("Pasku di Resurekshon"))
 
-            self[kings_day] = "Koningsdag [King's Day]"
+        # Di dos dia di Pasku di Resurekshon.
+        # Status: In-Use.
 
-        # Queen's Day
-        if 1891 <= year <= 2013:
-            queens_day = date(year, APR, 30)
-            if year <= 1948:
-                queens_day = date(year, AUG, 31)
+        # Easter Monday
+        self._add_easter_monday(tr("Di dos dia di Pasku di Resurekshon"))
+
+        # Dia di la Reina/Dia di Rey.
+        # Status: In-Use.
+        # Started under Queen Wilhelmina in 1891.
+        # Queen Beatrix kept Queen Juliana's Birthday after her coronation.
+        # Switched to Aña di Rey in 2014 for King Willem-Alexander.
+        # Have its name changed again to Dia di Rey from 2021 onwards.
+
+        # King's / Queen's Day
+        name = (
+            # King's Day.
+            tr("Dia di Rey")
+            if year >= 2014
+            # Queen's Day.
+            else tr("Dia di la Reina")
+        )
+        if year >= 2014:
+            dt = date(year, APR, 27)
+        else:
+            dt = date(year, APR, 30)
+        if self._is_sunday(dt):
+            dt += td(days=-1) if year >= 1980 else td(days=+1)
+        self._add_holiday(name, dt)
+
+        # Dia di Obrero.
+        # Status: In-Use.
+        # If fall on Sunday, then this will be move to next working day.
+
+        dt = date(year, MAY, 1)
+        if self._is_sunday(dt) or (self._is_monday(dt) and year <= 1979):
+            dt += td(days=+1)
+        # Labor Day
+        self._add_holiday(tr("Dia di Obrero"), dt)
+
+        # Dia di Asenshon.
+        # Status: In-Use.
 
-            if self._is_sunday(queens_day):
-                queens_day += td(days=1) if year < 1980 else td(days=-1)
+        # Ascension Day
+        self._add_ascension_thursday(tr("Dia di Asenshon"))
 
-            self[queens_day] = "Anja di La Reina [Queen's Day]"
+        # Dia di Himno i Bandera.
+        # Status: In-Use.
+        # Starts in 1984.
 
-        # Labour Day
-        labour_day = date(year, MAY, 1)
-        if self._is_sunday(labour_day):
-            labour_day += td(days=+1)
-        self[labour_day] = "Dia di Obrero [Labour Day]"
+        if year >= 1984:
+            # National Anthem and Flag Day
+            self._add_holiday(tr("Dia di Himno i Bandera"), JUL, 2)
 
-        # Ascension Day
-        self[easter_date + td(days=+39)] = "Hemelvaartsdag [Ascension Day]"
+        # Dia di Pais Kòrsou / Dia di autonomia.
+        # Status: In-Use.
+        # Starts in 2010.
 
-        # Dia di Himno y Bandera
-        self[
-            date(year, JUL, 2)
-        ] = "Dia di Himno y Bandera [National Anthem & Flag Day]"
+        if year >= 2010:
+            # Curaçao Day
+            self._add_holiday(tr("Dia di Pais Kòrsou"), OCT, 10)
 
-        # Dia di Pais Kòrsou
-        self[date(year, OCT, 10)] = "Dia di Pais Kòrsou [Curaçao Day]"
+        # Pasku di Nasementu.
+        # Status: In-Use.
 
         # Christmas Day
-        self[date(year, DEC, 25)] = "Kerstdag [Christmas]"
+        self._add_christmas_day(tr("Pasku di Nasementu"))
+
+        # Di dos dia di Pasku di Nasementu.
+        # Status: In-Use.
 
-        # Second Christmas
-        self[date(year, DEC, 26)] = "2de Kerstdag [Second Christmas]"
+        # Second Day of Christmas
+        self._add_christmas_day_two(tr("Di dos dia di Pasku di Nasementu"))
 
 
 class CW(Curacao):
diff --git a/holidays/locale/en_US/LC_MESSAGES/CW.po b/holidays/locale/en_US/LC_MESSAGES/CW.po
new file mode 100644
index 000000000..be6c22362
--- /dev/null
+++ b/holidays/locale/en_US/LC_MESSAGES/CW.po
@@ -0,0 +1,82 @@
+# Curacao holidays en_US localization.
+# Authors: PPsyrius <ppsyrius@ppsyrius.dev>, (c) 2023.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Python Holidays 0.27\n"
+"POT-Creation-Date: 2023-06-13 16:35+0700\n"
+"PO-Revision-Date: \n"
+"Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
+"Language-Team: Python Holidays localization team\n"
+"Language: en_US\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"Generated-By: pygettext.py 1.5\n"
+"X-Generator: Poedit 3.3.1\n"
+
+#. New Year's Day
+#: ./holidays/countries/curacao.py:50
+msgid "Aña Nobo"
+msgstr "New Year's Day"
+
+#. Carnival Monday
+#: ./holidays/countries/curacao.py:57
+msgid "Dialuna despues di Carnaval Grandi"
+msgstr "Carnival Monday"
+
+#. Good Friday
+#: ./holidays/countries/curacao.py:63
+msgid "Bièrnèsantu"
+msgstr "Good Friday"
+
+#. Easter Sunday
+#: ./holidays/countries/curacao.py:69
+msgid "Pasku di Resurekshon"
+msgstr "Easter Sunday"
+
+#. Easter Monday
+#: ./holidays/countries/curacao.py:75
+msgid "Di dos dia di Pasku di Resurekshon"
+msgstr "Easter Monday"
+
+#. King's Day.
+#: ./holidays/countries/curacao.py:87
+msgid "Dia di Rey"
+msgstr "King's Day"
+
+#. Queen's Day.
+#: ./holidays/countries/curacao.py:90
+msgid "Dia di la Reina"
+msgstr "Queen's Day"
+
+#. Labor Day
+#: ./holidays/countries/curacao.py:108
+msgid "Dia di Obrero"
+msgstr "Labor Day"
+
+#. Ascension Day
+#: ./holidays/countries/curacao.py:114
+msgid "Dia di Asenshon"
+msgstr "Ascension Day"
+
+#. National Anthem and Flag Day
+#: ./holidays/countries/curacao.py:122
+msgid "Dia di Himno i Bandera"
+msgstr "National Anthem and Flag Day"
+
+#. Curaçao Day
+#: ./holidays/countries/curacao.py:130
+msgid "Dia di Pais Kòrsou"
+msgstr "Curaçao Day"
+
+#. Christmas Day
+#: ./holidays/countries/curacao.py:136
+msgid "Pasku di Nasementu"
+msgstr "Christmas Day"
+
+#. Second Day of Christmas
+#: ./holidays/countries/curacao.py:142
+msgid "Di dos dia di Pasku di Nasementu"
+msgstr "Second Day of Christmas"
diff --git a/holidays/locale/nl/LC_MESSAGES/CW.po b/holidays/locale/nl/LC_MESSAGES/CW.po
new file mode 100644
index 000000000..dc12e589d
--- /dev/null
+++ b/holidays/locale/nl/LC_MESSAGES/CW.po
@@ -0,0 +1,82 @@
+# Curacao holidays nl localization.
+# Authors: PPsyrius <ppsyrius@ppsyrius.dev>, (c) 2023.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Python Holidays 0.27\n"
+"POT-Creation-Date: 2023-06-13 16:35+0700\n"
+"PO-Revision-Date: \n"
+"Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
+"Language-Team: Python Holidays localization team\n"
+"Language: nl\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"Generated-By: pygettext.py 1.5\n"
+"X-Generator: Poedit 3.3.1\n"
+
+#. New Year's Day
+#: ./holidays/countries/curacao.py:50
+msgid "Aña Nobo"
+msgstr "Nieuwjaarsdag"
+
+#. Carnival Monday
+#: ./holidays/countries/curacao.py:57
+msgid "Dialuna despues di Carnaval Grandi"
+msgstr "De maandag na de Grote Karnaval"
+
+#. Good Friday
+#: ./holidays/countries/curacao.py:63
+msgid "Bièrnèsantu"
+msgstr "Goede Vrijdag"
+
+#. Easter Sunday
+#: ./holidays/countries/curacao.py:69
+msgid "Pasku di Resurekshon"
+msgstr "Paasdag"
+
+#. Easter Monday
+#: ./holidays/countries/curacao.py:75
+msgid "Di dos dia di Pasku di Resurekshon"
+msgstr "Tweede paasdag"
+
+#. King's Day.
+#: ./holidays/countries/curacao.py:87
+msgid "Dia di Rey"
+msgstr "Koningsdag"
+
+#. Queen's Day.
+#: ./holidays/countries/curacao.py:90
+msgid "Dia di la Reina"
+msgstr "Koninginnedag"
+
+#. Labor Day
+#: ./holidays/countries/curacao.py:108
+msgid "Dia di Obrero"
+msgstr "Dag van de Arbeid"
+
+#. Ascension Day
+#: ./holidays/countries/curacao.py:114
+msgid "Dia di Asenshon"
+msgstr "Hemelvaartsdag"
+
+#. National Anthem and Flag Day
+#: ./holidays/countries/curacao.py:122
+msgid "Dia di Himno i Bandera"
+msgstr "Nationale vlag en volkslied"
+
+#. Curaçao Day
+#: ./holidays/countries/curacao.py:130
+msgid "Dia di Pais Kòrsou"
+msgstr "Dag van Land Curaçao"
+
+#. Christmas Day
+#: ./holidays/countries/curacao.py:136
+msgid "Pasku di Nasementu"
+msgstr "Kerst"
+
+#. Second Day of Christmas
+#: ./holidays/countries/curacao.py:142
+msgid "Di dos dia di Pasku di Nasementu"
+msgstr "Tweede kerstdag"
diff --git a/holidays/locale/pap/LC_MESSAGES/CW.po b/holidays/locale/pap/LC_MESSAGES/CW.po
new file mode 100644
index 000000000..ed217ac3a
--- /dev/null
+++ b/holidays/locale/pap/LC_MESSAGES/CW.po
@@ -0,0 +1,82 @@
+# Curacao holidays.
+# Authors: PPsyrius <ppsyrius@ppsyrius.dev>, (c) 2023.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Python Holidays 0.27\n"
+"POT-Creation-Date: 2023-06-13 16:35+0700\n"
+"PO-Revision-Date: \n"
+"Last-Translator: PPsyrius <ppsyrius@ppsyrius.dev>\n"
+"Language-Team: Python Holidays localization team\n"
+"Language: pap\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"Generated-By: pygettext.py 1.5\n"
+"X-Generator: Poedit 3.3.1\n"
+
+#. New Year's Day
+#: ./holidays/countries/curacao.py:50
+msgid "Aña Nobo"
+msgstr ""
+
+#. Carnival Monday
+#: ./holidays/countries/curacao.py:57
+msgid "Dialuna despues di Carnaval Grandi"
+msgstr ""
+
+#. Good Friday
+#: ./holidays/countries/curacao.py:63
+msgid "Bièrnèsantu"
+msgstr ""
+
+#. Easter Sunday
+#: ./holidays/countries/curacao.py:69
+msgid "Pasku di Resurekshon"
+msgstr ""
+
+#. Easter Monday
+#: ./holidays/countries/curacao.py:75
+msgid "Di dos dia di Pasku di Resurekshon"
+msgstr ""
+
+#. King's Day.
+#: ./holidays/countries/curacao.py:87
+msgid "Dia di Rey"
+msgstr ""
+
+#. Queen's Day.
+#: ./holidays/countries/curacao.py:90
+msgid "Dia di la Reina"
+msgstr ""
+
+#. Labor Day
+#: ./holidays/countries/curacao.py:108
+msgid "Dia di Obrero"
+msgstr ""
+
+#. Ascension Day
+#: ./holidays/countries/curacao.py:114
+msgid "Dia di Asenshon"
+msgstr ""
+
+#. National Anthem and Flag Day
+#: ./holidays/countries/curacao.py:122
+msgid "Dia di Himno i Bandera"
+msgstr ""
+
+#. Curaçao Day
+#: ./holidays/countries/curacao.py:130
+msgid "Dia di Pais Kòrsou"
+msgstr ""
+
+#. Christmas Day
+#: ./holidays/countries/curacao.py:136
+msgid "Pasku di Nasementu"
+msgstr ""
+
+#. Second Day of Christmas
+#: ./holidays/countries/curacao.py:142
+msgid "Di dos dia di Pasku di Nasementu"
+msgstr ""
diff --git a/holidays/locale/uk/LC_MESSAGES/CW.po b/holidays/locale/uk/LC_MESSAGES/CW.po
new file mode 100644
index 000000000..cb87407cc
--- /dev/null
+++ b/holidays/locale/uk/LC_MESSAGES/CW.po
@@ -0,0 +1,82 @@
+# Curacao holidays uk localization.
+# Authors: ~Jhellico <jhellico@gmail.com>, (c) 2023.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: Python Holidays 0.27\n"
+"POT-Creation-Date: 2023-06-13 16:35+0700\n"
+"PO-Revision-Date: \n"
+"Last-Translator: ~Jhellico <jhellico@gmail.com>\n"
+"Language-Team: Python Holidays localization team\n"
+"Language: uk\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<12 || n%100>14) ? 1 : 2);\n"
+"Generated-By: pygettext.py 1.5\n"
+"X-Generator: Poedit 3.3.1\n"
+
+#. New Year's Day
+#: ./holidays/countries/curacao.py:50
+msgid "Aña Nobo"
+msgstr "Новий рік"
+
+#. Carnival Monday
+#: ./holidays/countries/curacao.py:57
+msgid "Dialuna despues di Carnaval Grandi"
+msgstr "Карнавальний понеділок"
+
+#. Good Friday
+#: ./holidays/countries/curacao.py:63
+msgid "Bièrnèsantu"
+msgstr "Страсна пʼятниця"
+
+#. Easter Sunday
+#: ./holidays/countries/curacao.py:69
+msgid "Pasku di Resurekshon"
+msgstr "Великдень"
+
+#. Easter Monday
+#: ./holidays/countries/curacao.py:75
+msgid "Di dos dia di Pasku di Resurekshon"
+msgstr "Великодній понеділок"
+
+#. King's Day.
+#: ./holidays/countries/curacao.py:87
+msgid "Dia di Rey"
+msgstr "День короля"
+
+#. Queen's Day.
+#: ./holidays/countries/curacao.py:90
+msgid "Dia di la Reina"
+msgstr "День королеви"
+
+#. Labor Day
+#: ./holidays/countries/curacao.py:108
+msgid "Dia di Obrero"
+msgstr "День праці"
+
+#. Ascension Day
+#: ./holidays/countries/curacao.py:114
+msgid "Dia di Asenshon"
+msgstr "Вознесіння Господнє"
+
+#. National Anthem and Flag Day
+#: ./holidays/countries/curacao.py:122
+msgid "Dia di Himno i Bandera"
+msgstr "День державного гімну та прапора"
+
+#. Curaçao Day
+#: ./holidays/countries/curacao.py:130
+msgid "Dia di Pais Kòrsou"
+msgstr "День Кюрасао"
+
+#. Christmas Day
+#: ./holidays/countries/curacao.py:136
+msgid "Pasku di Nasementu"
+msgstr "Різдво Христове"
+
+#. Second Day of Christmas
+#: ./holidays/countries/curacao.py:142
+msgid "Di dos dia di Pasku di Nasementu"
+msgstr "Другий день Різдва"
diff --git a/tests/countries/test_curacao.py b/tests/countries/test_curacao.py
index 44bacbb6f..e29a5ead4 100644
--- a/tests/countries/test_curacao.py
+++ b/tests/countries/test_curacao.py
@@ -9,93 +9,187 @@
 #  Website: https://github.com/dr-prodigy/python-holidays
 #  License: MIT (see LICENSE file)
 
-import unittest
-from datetime import date
+from holidays.countries.curacao import Curacao, CW, CUW
+from tests.common import TestCase
 
-import holidays
 
+class TestCuracao(TestCase):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass(Curacao, years=range(1954, 2077))
 
-class TestCuracao(unittest.TestCase):
-    def setUp(self):
-        self.holidays = holidays.CW()
+    def test_country_aliases(self):
+        self.assertCountryAliases(Curacao, CW, CUW)
 
-    def test_2016(self):
-        self.assertIn(date(2016, 1, 1), self.holidays)
-        self.assertIn(date(2016, 2, 8), self.holidays)
-        self.assertIn(date(2016, 3, 25), self.holidays)
-        self.assertIn(date(2016, 3, 28), self.holidays)
-        self.assertIn(date(2016, 4, 27), self.holidays)
-        self.assertIn(date(2016, 5, 2), self.holidays)
-        self.assertIn(date(2016, 5, 5), self.holidays)
-        self.assertIn(date(2016, 7, 2), self.holidays)
-        self.assertIn(date(2016, 10, 10), self.holidays)
-        self.assertIn(date(2016, 12, 25), self.holidays)
-        self.assertIn(date(2016, 12, 26), self.holidays)
-
-    def test_new_years(self):
-        self.assertIn(date(2016, 1, 1), self.holidays)
-
-    def test_carnaval_monday(self):
-        self.assertIn(date(2016, 2, 8), self.holidays)
-
-    def test_easter_monday(self):
-        self.assertIn(date(2016, 3, 28), self.holidays)
-
-    def test_queens_day_between_1891_and_1948(self):
-        # Between 1891 and 1948 Queens Day was celebrated on 8-31
-        self.holidays = holidays.CW(years=[1901])
-        self.assertIn(date(1901, 8, 31), self.holidays)
-
-    def test_queens_day_between_1891_and_1948_substituted_later(self):
-        # Between 1891 and 1948 Queens Day was celebrated on 9-1
-        #  (one day later) when Queens Day falls on a Sunday
-        self.holidays = holidays.CW(years=[1947])
-        self.assertIn(date(1947, 9, 1), self.holidays)
-
-    def test_queens_day_between_1949_and_2013(self):
-        self.holidays = holidays.CW(years=[1965])
-        self.assertIn(date(1965, 4, 30), self.holidays)
-
-    def test_queens_day_between_1949_and_1980_substituted_later(self):
-        self.holidays = holidays.CW(years=[1967])
-        self.assertIn(date(1967, 5, 1), self.holidays)
-
-    def test_queens_day_between_1980_and_2013_substituted_earlier(self):
-        self.holidays = holidays.CW(years=[2006])
-        self.assertIn(date(2006, 4, 29), self.holidays)
+    def test_no_holidays(self):
+        self.assertNoHolidays(Curacao(years=1953))
 
-    def test_kings_day_after_2014(self):
-        self.holidays = holidays.CW(years=[2013])
-        self.assertNotIn(date(2013, 4, 27), self.holidays)
-
-        self.holidays = holidays.CW(years=[2016])
-        self.assertIn(date(2016, 4, 27), self.holidays)
-
-    def test_kings_day_after_2014_substituted_earlier(self):
-        self.holidays = holidays.CW(years=[2188])
-        self.assertIn(date(2188, 4, 26), self.holidays)
-
-    def test_labour_day(self):
-        self.holidays = holidays.CW(years=[2016])
-        self.assertNotIn(date(2016, 5, 1), self.holidays)
-
-        self.holidays = holidays.CW(years=[2017])
-        self.assertIn(date(2017, 5, 1), self.holidays)
-
-    def test_ascension_day(self):
-        self.holidays = holidays.CW(years=2016)
-        self.assertIn(date(2016, 5, 5), self.holidays)
-
-    def test_national_anthem_flagday(self):
-        self.assertIn(date(2016, 7, 2), self.holidays)
+    def test_2016(self):
+        self.assertHolidays(
+            Curacao(years=2016),
+            ("2016-01-01", "Aña Nobo"),
+            ("2016-02-08", "Dialuna despues di Carnaval Grandi"),
+            ("2016-03-25", "Bièrnèsantu"),
+            ("2016-03-27", "Pasku di Resurekshon"),
+            ("2016-03-28", "Di dos dia di Pasku di Resurekshon"),
+            ("2016-04-27", "Dia di Rey"),
+            ("2016-05-02", "Dia di Obrero"),
+            ("2016-05-05", "Dia di Asenshon"),
+            ("2016-07-02", "Dia di Himno i Bandera"),
+            ("2016-10-10", "Dia di Pais Kòrsou"),
+            ("2016-12-25", "Pasku di Nasementu"),
+            ("2016-12-26", "Di dos dia di Pasku di Nasementu"),
+        )
+
+    def test_queens_day(self):
+        name = "Dia di la Reina"
+        self.assertHolidayName(
+            name,
+            "1961-05-01",
+            "1965-04-30",
+            "1967-05-01",
+            "1972-05-01",
+            "1978-05-01",
+            "1989-04-29",
+            "1995-04-29",
+            "2000-04-29",
+            "2006-04-29",
+            "2013-04-30",
+        )
+        self.assertNoHoliday(
+            "1961-04-30",
+            "1967-04-30",
+            "1972-04-30",
+            "1978-04-30",
+            "1995-04-30",
+            "1989-04-30",
+            "2000-04-30",
+            "2006-04-30",
+        )
+        self.assertNoHolidayName(name, 2014)
+
+    def test_king_day(self):
+        name = "Dia di Rey"
+        self.assertNoHolidayName(name, 2013)
+        self.assertHolidayName(
+            name,
+            "2016-04-27",
+            "2017-04-27",
+            "2018-04-27",
+            "2019-04-27",
+            "2020-04-27",
+            "2021-04-27",
+            "2022-04-27",
+            "2023-04-27",
+            "2024-04-27",
+            "2025-04-26",
+            "2031-04-26",
+            "2036-04-26",
+        )
+        self.assertNoHoliday(
+            "2014-04-27",
+            "2025-04-27",
+            "2031-04-27",
+            "2036-04-27",
+        )
+
+    def test_labor_day(self):
+        self.assertHolidayName(
+            "Dia di Obrero",
+            "2016-05-02",
+            "2017-05-01",
+            "2018-05-01",
+            "2019-05-01",
+            "2020-05-01",
+            "2021-05-01",
+            "2022-05-02",
+            "2023-05-01",
+        )
+        self.assertNoHoliday(
+            "2011-05-01",
+            "2016-05-01",
+            "2022-05-01",
+        )
+
+    def test_anthem_and_flag_day(self):
+        name = "Dia di Himno i Bandera"
+        self.assertNoHolidayName(name, 1983)
+        self.assertHolidayName(
+            name,
+            (f"{year}-07-02" for year in range(1984, 2077)),
+        )
 
     def test_curacao_day(self):
-        self.assertIn(date(2016, 10, 10), self.holidays)
-
-    def test_first_christmas(self):
-        self.holidays = holidays.CW(years=2016)
-        self.assertIn(date(2016, 12, 25), self.holidays)
-
-    def test_second_christmas(self):
-        self.holidays = holidays.CW(years=2016)
-        self.assertIn(date(2016, 12, 26), self.holidays)
+        name = "Dia di Pais Kòrsou"
+        self.assertNoHolidayName(name, 2009)
+        self.assertHolidayName(
+            name,
+            (f"{year}-10-10" for year in range(2010, 2077)),
+        )
+
+    def test_l10n_default(self):
+        self.assertLocalizedHolidays(
+            ("2023-01-01", "Aña Nobo"),
+            ("2023-02-20", "Dialuna despues di Carnaval Grandi"),
+            ("2023-04-07", "Bièrnèsantu"),
+            ("2023-04-09", "Pasku di Resurekshon"),
+            ("2023-04-10", "Di dos dia di Pasku di Resurekshon"),
+            ("2023-04-27", "Dia di Rey"),
+            ("2023-05-01", "Dia di Obrero"),
+            ("2023-05-18", "Dia di Asenshon"),
+            ("2023-07-02", "Dia di Himno i Bandera"),
+            ("2023-10-10", "Dia di Pais Kòrsou"),
+            ("2023-12-25", "Pasku di Nasementu"),
+            ("2023-12-26", "Di dos dia di Pasku di Nasementu"),
+        )
+
+    def test_l10n_en_us(self):
+        self.assertLocalizedHolidays(
+            "en_US",
+            ("2023-01-01", "New Year's Day"),
+            ("2023-02-20", "Carnival Monday"),
+            ("2023-04-07", "Good Friday"),
+            ("2023-04-09", "Easter Sunday"),
+            ("2023-04-10", "Easter Monday"),
+            ("2023-04-27", "King's Day"),
+            ("2023-05-01", "Labor Day"),
+            ("2023-05-18", "Ascension Day"),
+            ("2023-07-02", "National Anthem and Flag Day"),
+            ("2023-10-10", "Curaçao Day"),
+            ("2023-12-25", "Christmas Day"),
+            ("2023-12-26", "Second Day of Christmas"),
+        )
+
+    def test_l10n_nl(self):
+        self.assertLocalizedHolidays(
+            "nl",
+            ("2023-01-01", "Nieuwjaarsdag"),
+            ("2023-02-20", "De maandag na de Grote Karnaval"),
+            ("2023-04-07", "Goede Vrijdag"),
+            ("2023-04-09", "Paasdag"),
+            ("2023-04-10", "Tweede paasdag"),
+            ("2023-04-27", "Koningsdag"),
+            ("2023-05-01", "Dag van de Arbeid"),
+            ("2023-05-18", "Hemelvaartsdag"),
+            ("2023-07-02", "Nationale vlag en volkslied"),
+            ("2023-10-10", "Dag van Land Curaçao"),
+            ("2023-12-25", "Kerst"),
+            ("2023-12-26", "Tweede kerstdag"),
+        )
+
+    def test_l10n_uk(self):
+        self.assertLocalizedHolidays(
+            "uk",
+            ("2023-01-01", "Новий рік"),
+            ("2023-02-20", "Карнавальний понеділок"),
+            ("2023-04-07", "Страсна пʼятниця"),
+            ("2023-04-09", "Великдень"),
+            ("2023-04-10", "Великодній понеділок"),
+            ("2023-04-27", "День короля"),
+            ("2023-05-01", "День праці"),
+            ("2023-05-18", "Вознесіння Господнє"),
+            ("2023-07-02", "День державного гімну та прапора"),
+            ("2023-10-10", "День Кюрасао"),
+            ("2023-12-25", "Різдво Христове"),
+            ("2023-12-26", "Другий день Різдва"),
+        )