Update Ireland holidays

holidays/countries/ireland.py

@@ -9,35 +9,33 @@
 #  Website: https://github.com/dr-prodigy/python-holidays
 #  License: MIT (see LICENSE file)
 
-from holidays.calendars.gregorian import FEB, MAR
+from holidays.calendars.gregorian import FEB, MAR, SEP, DEC
 from holidays.groups import ChristianHolidays, InternationalHolidays, StaticHolidays
-from holidays.observed_holiday_base import (
-    ObservedHolidayBase,
-    SAT_SUN_TO_NEXT_MON,
-    SAT_SUN_TO_NEXT_MON_TUE,
-)
+from holidays.holiday_base import HolidayBase
 
 
-class Ireland(ObservedHolidayBase, ChristianHolidays, InternationalHolidays, StaticHolidays):
+class Ireland(HolidayBase, ChristianHolidays, InternationalHolidays, StaticHolidays):
     """
-    Official holidays in Ireland, as declared in the Citizen's Information
-    bulletin:
-    https://www.citizensinformation.ie/en/employment/employment_rights_and_conditions/leave_and_holidays/public_holidays_in_ireland.html
+    References:
+        - https://en.wikipedia.org/wiki/Public_holidays_in_the_Republic_of_Ireland
+        - https://www.citizensinformation.ie/en/employment/employment_rights_and_conditions/leave_and_holidays/public_holidays_in_ireland.html  # noqa: E501
     """
 
     country = "IE"
-    observed_label = "%s (observed)"
 
     def __init__(self, *args, **kwargs):
         ChristianHolidays.__init__(self)
         InternationalHolidays.__init__(self)
         StaticHolidays.__init__(self, IrelandStaticHolidays)
-        kwargs.setdefault("observed_rule", SAT_SUN_TO_NEXT_MON)
         super().__init__(*args, **kwargs)
 
     def _populate_public_holidays(self):
+        if self._year <= 1871:
+            return None
+
         # New Year's Day.
-        self._add_new_years_day("New Year's Day")
+        if self._year >= 1975:
+            self._add_new_years_day("New Year's Day")
 
         # St. Brigid's Day.
         if self._year >= 2023:
@@ -48,35 +46,39 @@ def _populate_public_holidays(self):
                 self._add_holiday_1st_mon_from_feb_1(name)
 
         # St. Patrick's Day.
-        self._add_observed(self._add_holiday_mar_17("St. Patrick's Day"))
+        if self._year >= 1903:
+            self._add_holiday_mar_17("St. Patrick's Day")
 
         # Easter Monday.
         self._add_easter_monday("Easter Monday")
 
         # May Day.
-        if self._year >= 1978:
+        if self._year >= 1994:
             name = "May Day"
             if self._year == 1995:
                 self._add_holiday_may_8(name)
             else:
                 self._add_holiday_1st_mon_of_may(name)
 
-        # June Bank holiday.
-        self._add_holiday_1st_mon_of_jun("June Bank Holiday")
+        if self._year >= 1973:
+            # June Bank holiday.
+            self._add_holiday_1st_mon_of_jun("June Bank Holiday")
+        else:
+            # Whit Monday.
+            self._add_whit_monday("Whit Monday")
 
-        # Summer Bank holiday.
+        # August Bank holiday.
         self._add_holiday_1st_mon_of_aug("August Bank Holiday")
 
         # October Bank Holiday.
-        self._add_holiday_last_mon_of_oct("October Bank Holiday")
+        if self._year >= 1977:
+            self._add_holiday_last_mon_of_oct("October Bank Holiday")
 
         # Christmas Day.
-        self._add_observed(self._add_christmas_day("Christmas Day"))
+        self._add_christmas_day("Christmas Day")
 
         # St. Stephen's Day.
-        self._add_observed(
-            self._add_christmas_day_two("St. Stephen's Day"), rule=SAT_SUN_TO_NEXT_MON_TUE
-        )
+        self._add_christmas_day_two("St. Stephen's Day")
 
 
 class IE(Ireland):
@@ -89,5 +91,7 @@ class IRL(Ireland):
 
 class IrelandStaticHolidays:
     special_public_holidays = {
+        1999: (DEC, 31, "Millennium Celebrations"),
+        2011: (SEP, 14, "National Day of Mourning"),
         2022: (MAR, 18, "Day of Remembrance and Recognition"),
     }