Add Finnish unofficial holidays

Current implementation generates only list of Public holidays (so holidays established by Parliament). However there are also quite a lot of so called "flag flying days" ("liputuspäivät" in Finnish or "flaggdagar" in Swedish) that don't have official holiday status, but still it's quite common for businesses to have shorter opening hours or to be completely closed. So this adds a list of those holidays under unofficial category. The English and Swedish translations are taken from the Ministry of the Interior website, and for Ukrainian one I asked a Ukrainian friend of mine (who's native language is Ukrainian) to review the list for me. Sources: - https://en.wikipedia.org/wiki/Flag_flying_days_in_Finland - https://intermin.fi/en/flag-and-arms/flag-flying-days (Ministry of the Interior of Finland)
vacanza · Jul 29, 2024 · 2e7204e · 2e7204e
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diff --git a/AUTHORS b/AUTHORS
@@ -8,6 +8,7 @@ Akos Furton
 Alejandro Antunes
 Alexander Schulze
 Alexandre Carvalho
+Alexei Mikhailov
 Anders Wenhaug
 Andrei Klimenko
 Andres Marrugo

diff --git a/README.rst b/README.rst
@@ -424,7 +424,7 @@ All other default values are highlighted with bold:
      - FI
      -
      - en_US, **fi**, sv_FI, uk
-     -
+     - UNOFFICIAL
    * - France
      - FR
      - Départements: BL, GES, GP, GY, MF, MQ, NC, PF, RE, WF, YT
@@ -947,7 +947,7 @@ following financial markets are available:
    * - European Central Bank
      - ECB
      - Trans-European Automated Real-time Gross Settlement (TARGET2)
-   * - ICE Futures Europe 
+   * - ICE Futures Europe
      - IFEU
      - A London-based Investment Exchange holidays
    * - New York Stock Exchange

diff --git a/holidays/countries/finland.py b/holidays/countries/finland.py
@@ -13,6 +13,7 @@
 from gettext import gettext as tr
 
 from holidays.calendars.gregorian import _timedelta
+from holidays.constants import PUBLIC, UNOFFICIAL
 from holidays.groups import ChristianHolidays, InternationalHolidays
 from holidays.holiday_base import HolidayBase
 
@@ -24,11 +25,14 @@ class Finland(HolidayBase, ChristianHolidays, InternationalHolidays):
         - `Bank holidays (Finnish) <https://www.suomenpankki.fi/fi/raha-ja-maksaminen/pankkivapaapaivat/>`_
         - `Bank holidays (English) <https://www.suomenpankki.fi/en/money-and-payments/bank-holidays/>`_
         - `Bank holidays (Swedish) <https://www.suomenpankki.fi/sv/pengar-och-betalningar/bankfria-dagar-i-finland/>`_
+        - https://en.wikipedia.org/wiki/Flag_flying_days_in_Finland#Customary_flag_days
+        - https://intermin.fi/en/flag-and-arms/flag-flying-days
     """
 
     country = "FI"
     default_language = "fi"
     supported_languages = ("en_US", "fi", "sv_FI", "uk")
+    supported_categories = (PUBLIC, UNOFFICIAL)
 
     def __init__(self, *args, **kwargs):
         ChristianHolidays.__init__(self)
@@ -97,6 +101,71 @@ def _populate_public_holidays(self):
         # Second Day of Christmas.
         self._add_christmas_day_two(tr("Tapaninpäivä"))
 
+    def _populate_unofficial_holidays(self):
+        if self._year >= 2012:
+            # Day of Finnish architecture and design, Birthday of Alvar Aalto.
+            self._add_holiday_feb_3(tr("Arkkitehtuurin ja muotoilun päiviä"))
+
+        if self._year >= 1854:
+            # Birthday of the national poet Johan Ludvig Runeberg
+            self._add_holiday_feb_5(tr("Runebergin päivä"))
+
+        if self._year >= 2007:
+            # Birthday of novelist and playwright Minna Canth and Day of Equality
+            self._add_holiday_mar_19(tr("Minna Canthin päivä, tasa-arvon päivä"))
+
+        if self._year >= 1978:
+            # The day Mikael Agricola and Day of the Finnish language
+            self._add_holiday_apr_9(tr("Mikael Agricolan päivä, suomen kielen päivä"))
+
+        if self._year >= 1987:
+            # National Veterans' Day
+            self._add_holiday_apr_27(tr("Kansallinen veteraanipäivä"))
+
+        if self._year >= 2019:
+            # Europe Day
+            self._add_holiday_may_9(tr("Eurooppa-päivä"))
+
+        if self._year >= 1952:
+            # Day of Finnish Identity (or The Finnish Identity Day)
+            self._add_holiday_may_12(tr("Suomalaisuuden päivä"))
+
+        if self._year >= 1977:
+            # Remembrance Day
+            self._add_holiday_3rd_sun_of_may(tr("Kaatuneitten muistopäivä"))
+
+        if self._year >= 1992:
+            # Birthday of the poet Eino Leino
+            self._add_holiday_jul_6(tr("Eino Leinon päivä"))
+
+        if self._year >= 2013:
+            # Finland’s Nature Day
+            self._add_holiday_last_sat_of_aug(tr("Suomen luonnon päivä"))
+
+        if self._year >= 2016:
+            # Miina Sillanpää Day, Day of Civic Participation
+            self._add_holiday_oct_1(tr("Miina Sillanpään ja kansalaisvaikuttamisen päivä"))
+
+        if self._year >= 1950:
+            # Birthday of the National writer Aleksis Kivi
+            self._add_holiday_oct_10(tr("Aleksis Kiven päivä"))
+
+        if self._year >= 1987:
+            # United Nations Day
+            self._add_united_nations_day(tr("Yhdistyneiden Kansakuntien päivä"))
+
+        if self._year >= 1908:
+            # Finnish Swedish Heritage Day
+            self._add_holiday_nov_6(tr("Ruotsalaisuuden päivä"))
+
+        if self._year >= 2020:
+            # Day of Children's Rights
+            self._add_holiday_nov_20(tr("Lapsen oikeuksien päivä"))
+
+        if self._year >= 2007:
+            # Birthday of the composer Jean Sibelius, Day of Finnish Music
+            self._add_holiday_dec_8(tr("Jean Sibeliuksen päivä"))
+
 
 class FI(Finland):
     pass

diff --git a/holidays/locale/en_US/LC_MESSAGES/FI.po b/holidays/locale/en_US/LC_MESSAGES/FI.po
@@ -86,3 +86,67 @@ msgstr "Christmas Day"
 #. Second Day of Christmas.
 msgid "Tapaninpäivä"
 msgstr "Second Day of Christmas"
+
+#. Day of Finnish architecture and design, Birthday of Alvar Aalto.
+msgid "Arkkitehtuurin ja muotoilun päiviä"
+msgstr "Day of Finnish architecture and design"
+
+#. Birthday of the national poet Johan Ludvig Runeberg
+msgid "Runebergin päivä"
+msgstr "Birthday of the national poet Johan Ludvig Runeberg"
+
+#. National Veterans' Day
+msgid "Kansallinen veteraanipäivä"
+msgstr "National Veterans' Day"
+
+#. Europe Day
+msgid "Eurooppa-päivä"
+msgstr "Europe Day"
+
+#. Day of Finnish Identity (or The Finnish Identity Day)
+msgid "Suomalaisuuden päivä"
+msgstr "Day of Finnish Identity"
+
+#. Remembrance Day
+msgid "Kaatuneitten muistopäivä"
+msgstr "Remembrance Day"
+
+#. Birthday of the poet Eino Leino
+msgid "Eino Leinon päivä"
+msgstr "Birthday of the poet Eino Leino"
+
+#. Finland’s Nature Day
+msgid "Suomen luonnon päivä"
+msgstr "Finland’s Nature Day"
+
+#. Miina Sillanpää Day, Day of Civic Participation
+msgid "Miina Sillanpään ja kansalaisvaikuttamisen päivä"
+msgstr "Miina Sillanpää Day, Day of Civic Participation"
+
+#. Birthday of the National writer Aleksis Kivi
+msgid "Aleksis Kiven päivä"
+msgstr "Birthday of the National writer Aleksis Kivi"
+
+#. United Nations Day
+msgid "Yhdistyneiden Kansakuntien päivä"
+msgstr "United Nations Day"
+
+#. Day of Children's Rights
+msgid "Lapsen oikeuksien päivä"
+msgstr "Day of Children's Rights"
+
+#. Birthday of the composer Jean Sibelius, Day of Finnish Music
+msgid "Jean Sibeliuksen päivä"
+msgstr "Birthday of the composer Jean Sibelius, Day of Finnish Music"
+
+#. Birthday of novelist and playwright Minna Canth and Day of Equality
+msgid "Minna Canthin päivä, tasa-arvon päivä"
+msgstr "Birthday of novelist and playwright Minna Canth and Day of Equality"
+
+#. The day Mikael Agricola and Day of the Finnish language
+msgid "Mikael Agricolan päivä, suomen kielen päivä"
+msgstr "The day Mikael Agricola and Day of the Finnish language"
+
+#. Finnish Swedish Heritage Day
+msgid "Ruotsalaisuuden päivä"
+msgstr "Finnish Swedish Heritage Day"
diff --git a/holidays/locale/fi/LC_MESSAGES/FI.po b/holidays/locale/fi/LC_MESSAGES/FI.po
@@ -86,3 +86,67 @@ msgstr ""
 #. Second Day of Christmas.
 msgid "Tapaninpäivä"
 msgstr ""
+
+#. Day of Finnish architecture and design, Birthday of Alvar Aalto.
+msgid "Arkkitehtuurin ja muotoilun päiviä"
+msgstr ""
+
+#. Birthday of the national poet Johan Ludvig Runeberg
+msgid "Runebergin päivä"
+msgstr ""
+
+#. National Veterans' Day
+msgid "Kansallinen veteraanipäivä"
+msgstr ""
+
+#. Europe Day
+msgid "Eurooppa-päivä"
+msgstr ""
+
+#. Day of Finnish Identity (or The Finnish Identity Day)
+msgid "Suomalaisuuden päivä"
+msgstr ""
+
+#. Remembrance Day
+msgid "Kaatuneitten muistopäivä"
+msgstr ""
+
+#. Birthday of the poet Eino Leino
+msgid "Eino Leinon päivä"
+msgstr ""
+
+#. Finland’s Nature Day
+msgid "Suomen luonnon päivä"
+msgstr ""
+
+#. Miina Sillanpää Day, Day of Civic Participation
+msgid "Miina Sillanpään ja kansalaisvaikuttamisen päivä"
+msgstr ""
+
+#. Birthday of the National writer Aleksis Kivi
+msgid "Aleksis Kiven päivä"
+msgstr ""
+
+#. United Nations Day
+msgid "Yhdistyneiden Kansakuntien päivä"
+msgstr ""
+
+#. Day of Children's Rights
+msgid "Lapsen oikeuksien päivä"
+msgstr ""
+
+#. Birthday of the composer Jean Sibelius, Day of Finnish Music
+msgid "Jean Sibeliuksen päivä"
+msgstr ""
+
+#. Birthday of novelist and playwright Minna Canth and Day of Equality
+msgid "Minna Canthin päivä, tasa-arvon päivä"
+msgstr ""
+
+#. The day Mikael Agricola and Day of the Finnish language
+msgid "Mikael Agricolan päivä, suomen kielen päivä"
+msgstr ""
+
+#. Finnish Swedish Heritage Day
+msgid "Ruotsalaisuuden päivä"
+msgstr ""
diff --git a/holidays/locale/sv_FI/LC_MESSAGES/FI.po b/holidays/locale/sv_FI/LC_MESSAGES/FI.po
@@ -86,3 +86,67 @@ msgstr "Juldagen"
 #. Second Day of Christmas.
 msgid "Tapaninpäivä"
 msgstr "Annandag jul"
+
+#. Day of Finnish architecture and design, Birthday of Alvar Aalto.
+msgid "Arkkitehtuurin ja muotoilun päiviä"
+msgstr "Arkitekturens dag"
+
+#. Birthday of the national poet Johan Ludvig Runeberg
+msgid "Runebergin päivä"
+msgstr "Runebergsdagen"
+
+#. National Veterans' Day
+msgid "Kansallinen veteraanipäivä"
+msgstr "Nationella veterandagen"
+
+#. Europe Day
+msgid "Eurooppa-päivä"
+msgstr "Europadagen"
+
+#. Day of Finnish Identity (or The Finnish Identity Day)
+msgid "Suomalaisuuden päivä"
+msgstr "Finskhetens dag"
+
+#. Remembrance Day
+msgid "Kaatuneitten muistopäivä"
+msgstr "De stupades dag"
+
+#. Birthday of the poet Eino Leino
+msgid "Eino Leinon päivä"
+msgstr "Eino Leinodagen"
+
+#. Finland’s Nature Day
+msgid "Suomen luonnon päivä"
+msgstr "Den finska naturens dag"
+
+#. Miina Sillanpää Day, Day of Civic Participation
+msgid "Miina Sillanpään ja kansalaisvaikuttamisen päivä"
+msgstr "Miina Sillanpää-dagen, medborgarinflytandets dag"
+
+#. Birthday of the National writer Aleksis Kivi
+msgid "Aleksis Kiven päivä"
+msgstr "Aleksis Kividagen, den finska litteraturens dag"
+
+#. United Nations Day
+msgid "Yhdistyneiden Kansakuntien päivä"
+msgstr "FN-dagen"
+
+#. Finnish Swedish Heritage Day
+msgid "Ruotsalaisuuden päivä"
+msgstr "Svenska dagen"
+
+#. Day of Children's Rights
+msgid "Lapsen oikeuksien päivä"
+msgstr "Barnkonventionens dag"
+
+#. Birthday of the composer Jean Sibelius, Day of Finnish Music
+msgid "Jean Sibeliuksen päivä"
+msgstr "Jean Sibeliusdagen"
+
+#. Birthday of novelist and playwright Minna Canth and Day of Equality
+msgid "Minna Canthin päivä, tasa-arvon päivä"
+msgstr "Minna Canth-dagen, jämställdhetsdagen"
+
+#. The day Mikael Agricola and Day of the Finnish language
+msgid "Mikael Agricolan päivä, suomen kielen päivä"
+msgstr "Mikael Agricoladagen, finska språkets dag"
diff --git a/holidays/locale/uk/LC_MESSAGES/FI.po b/holidays/locale/uk/LC_MESSAGES/FI.po
@@ -86,3 +86,69 @@ msgstr "Різдво Христове"
 #. Second Day of Christmas.
 msgid "Tapaninpäivä"
 msgstr "Другий день Різдва"
+
+#. Day of Finnish architecture and design, Birthday of Alvar Aalto.
+msgid "Arkkitehtuurin ja muotoilun päiviä"
+msgstr "Дні архітектури та дизайну"
+
+#. Birthday of the national poet Johan Ludvig Runeberg
+msgid "Runebergin päivä"
+msgstr "День народження народного поета Йохана Людвіга Рунеберга"
+
+#. National Veterans' Day
+msgid "Kansallinen veteraanipäivä"
+msgstr "Національний день ветеранів"
+
+#. Europe Day
+msgid "Eurooppa-päivä"
+msgstr "День Європи"
+
+#. Day of Finnish Identity (or The Finnish Identity Day)
+msgid "Suomalaisuuden päivä"
+msgstr "День народження державного діяча Йохана Вільгельма Шелмана"
+
+#. Remembrance Day
+msgid "Kaatuneitten muistopäivä"
+msgstr "День ветеранів Національної війни"
+
+#. Birthday of the poet Eino Leino
+msgid "Eino Leinon päivä"
+msgstr "День народження поета Ейно Лейно"
+
+#. Finland’s Nature Day
+msgid "Suomen luonnon päivä"
+msgstr "День природи Фінляндії"
+
+#. Miina Sillanpää Day, Day of Civic Participation
+msgid "Miina Sillanpään ja kansalaisvaikuttamisen päivä"
+msgstr "День Міїни Сілланпяя та громадянської активності."
+
+#. Birthday of the National writer Aleksis Kivi
+msgid "Aleksis Kiven päivä"
+msgstr ""
+"День народження народного письменника Алексіса Ківі, День фінської "
+"літератури"
+
+#. United Nations Day
+msgid "Yhdistyneiden Kansakuntien päivä"
+msgstr "День Організації Об'єднаних Націй"
+
+#. Day of Children's Rights
+msgid "Lapsen oikeuksien päivä"
+msgstr "День прав дитини"
+
+#. Birthday of the composer Jean Sibelius, Day of Finnish Music
+msgid "Jean Sibeliuksen päivä"
+msgstr "День Жана Сібеліуса, День фінської музики"
+
+#. Birthday of novelist and playwright Minna Canth and Day of Equality
+msgid "Minna Canthin päivä, tasa-arvon päivä"
+msgstr "День народження Мінни Кант, День рівності"
+
+#. The day Mikael Agricola and Day of the Finnish language
+msgid "Mikael Agricolan päivä, suomen kielen päivä"
+msgstr "День Мікаеля Аґріколи, День фінської мови"
+
+#. Finnish Swedish Heritage Day
+msgid "Ruotsalaisuuden päivä"
+msgstr "День шведської ідентичності"