some new features

.venv/lib/python3.12/site-packages/holidays/countries/serbia.py

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+#  holidays
+#  --------
+#  A fast, efficient Python library for generating country, province and state
+#  specific sets of holidays on the fly. It aims to make determining whether a
+#  specific date is a holiday as fast and flexible as possible.
+#
+#  Authors: Vacanza Team and individual contributors (see CONTRIBUTORS file)
+#           dr-prodigy <dr.prodigy.github@gmail.com> (c) 2017-2023
+#           ryanss <ryanssdev@icloud.com> (c) 2014-2017
+#  Website: https://github.com/vacanza/holidays
+#  License: MIT (see LICENSE file)
+
+from gettext import gettext as tr
+
+from holidays.calendars.julian import JULIAN_CALENDAR
+from holidays.groups import ChristianHolidays, InternationalHolidays
+from holidays.observed_holiday_base import ObservedHolidayBase, SUN_TO_NEXT_MON, SUN_TO_NEXT_TUE
+
+
+class Serbia(ObservedHolidayBase, ChristianHolidays, InternationalHolidays):
+    """Serbia holidays.
+
+    References:
+        * <https://en.wikipedia.org/wiki/Public_holidays_in_Serbia>
+    """
+
+    country = "RS"
+    default_language = "sr"
+    # %s (observed).
+    observed_label = tr("%s (слободан дан)")
+    supported_languages = ("en_US", "sr")
+
+    def __init__(self, *args, **kwargs):
+        ChristianHolidays.__init__(self, JULIAN_CALENDAR)
+        InternationalHolidays.__init__(self)
+        kwargs.setdefault("observed_rule", SUN_TO_NEXT_MON)
+        super().__init__(*args, **kwargs)
+
+    def _populate_public_holidays(self):
+        # New Year's Day.
+        name = tr("Нова година")
+        self._add_observed(self._add_new_years_day(name), rule=SUN_TO_NEXT_TUE)
+        self._add_observed(self._add_new_years_day_two(name))
+
+        # Orthodox Christmas Day.
+        self._add_christmas_day(tr("Божић"))
+
+        # Statehood Day.
+        name = tr("Дан државности Србије")
+        self._add_observed(self._add_holiday_feb_15(name), rule=SUN_TO_NEXT_TUE)
+        self._add_observed(self._add_holiday_feb_16(name))
+
+        # Labor Day.
+        name = tr("Празник рада")
+        self._add_observed(self._add_labor_day(name), rule=SUN_TO_NEXT_TUE)
+
+        self._add_observed(
+            may_2 := self._add_labor_day_two(name),
+            rule=SUN_TO_NEXT_TUE if may_2 == self._easter_sunday else SUN_TO_NEXT_MON,
+        )
+
+        # Armistice Day.
+        self._add_observed(self._add_remembrance_day(tr("Дан примирја у Првом светском рату")))
+
+        # Good Friday.
+        self._add_good_friday(tr("Велики петак"))
+        # Holy Saturday.
+        self._add_holy_saturday(tr("Велика субота"))
+        # Easter Sunday.
+        self._add_easter_sunday(tr("Васкрс"))
+        # Easter Monday.
+        self._add_easter_monday(tr("Други дан Васкрса"))
+
+
+class RS(Serbia):
+    pass
+
+
+class SRB(Serbia):
+    pass