Add Easter Tuesday to Christian holidays group

holidays/countries/australia.py

@@ -696,7 +696,7 @@ def _populate_subdiv_tas_public_holidays(self):
 
         # Easter Tuesday.
         if self._year <= 2010:
-            self._add_holiday_2_days_past_easter("Easter Tuesday")
+            self._add_easter_tuesday("Easter Tuesday")
 
         # ANZAC Day.
         if self._year >= 1921:

holidays/countries/cyprus.py

@@ -92,7 +92,7 @@ def _populate_bank_holidays(self):
             return None
 
         # Easter Tuesday.
-        self._add_holiday_2_days_past_easter(tr("Τρίτη της Διακαινησίμου"))
+        self._add_easter_tuesday(tr("Τρίτη της Διακαινησίμου"))
 
     def _populate_optional_holidays(self):
         if self._year <= 1960:

holidays/countries/hongkong.py

@@ -277,7 +277,7 @@ def _populate_optional_holidays(self):
         # Easter Monday.
         if self._year >= 1968 and dt_qingming == self._easter_sunday:
             # 復活節星期一翌日.
-            self._add_holiday_2_days_past_easter("The day following Easter Monday")
+            self._add_easter_tuesday("The day following Easter Monday")
         else:
             # 復活節星期一.
             self._add_easter_monday("Easter Monday")

holidays/countries/new_zealand.py

@@ -253,7 +253,7 @@ def _populate_subdiv_stc_public_holidays(self):
     def _populate_subdiv_stl_public_holidays(self):
         name = "Southland Anniversary Day"
         if self._year >= 2012:
-            self._add_holiday_2_days_past_easter(name)
+            self._add_easter_tuesday(name)
         else:
             self._add_holiday(name, self._get_nearest_monday(JAN, 17))
 

holidays/groups/christian.py

@@ -276,6 +276,15 @@ def _add_easter_sunday(self, name, calendar=None) -> date:
         """
         return self._add_holiday(name, self.__get_easter_sunday(calendar))
 
+    def _add_easter_tuesday(self, name, calendar=None) -> date:
+        """
+        Add Easter Tuesday (2 day after Easter Sunday).
+
+        Easter Tuesday is the third day of Eastertide and is a holiday in some areas.
+        https://en.wikipedia.org/wiki/Easter_Tuesday
+        """
+        return self._add_holiday(name, _timedelta(self.__get_easter_sunday(calendar), +2))
+
     def _add_epiphany_day(self, name, calendar=None) -> date:
         """
         Add Epiphany Day.