use zoneinfo instead of pytz (#1179)

Co-authored-by: Jad Chaar <jadchaar@users.noreply.github.com>

pyproject.toml

@@ -41,6 +41,7 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 test = [
+    "backports.zoneinfo==0.2.1;python_version<'3.9'",
     "dateparser==1.*",
     "pre-commit",
     "pytest",

requirements/requirements-tests.txt

@@ -1,4 +1,5 @@
 -r requirements.txt
+backports.zoneinfo==0.2.1;python_version<'3.9'
 dateparser==1.*
 pre-commit
 pytest

tests/test_arrow.py

@@ -1,3 +1,8 @@
+try:
+    import zoneinfo
+except ImportError:
+    from backports import zoneinfo
+
 import pickle
 import sys
 import time
@@ -67,6 +72,16 @@ def test_init_pytz_timezone(self):
         assert result._datetime == self.expected
         assert_datetime_equality(result._datetime, self.expected, 1)
 
+    def test_init_zoneinfo_timezone(self):
+        result = arrow.Arrow(
+            2024, 7, 10, 18, 55, 45, 999999, tzinfo=zoneinfo.ZoneInfo("Europe/Paris")
+        )
+        self.expected = datetime(
+            2024, 7, 10, 18, 55, 45, 999999, tzinfo=zoneinfo.ZoneInfo("Europe/Paris")
+        )
+        assert result._datetime == self.expected
+        assert_datetime_equality(result._datetime, self.expected, 1)
+
     def test_init_with_fold(self):
         before = arrow.Arrow(2017, 10, 29, 2, 0, tzinfo="Europe/Stockholm")
         after = arrow.Arrow(2017, 10, 29, 2, 0, tzinfo="Europe/Stockholm", fold=1)

tests/test_formatter.py

@@ -1,7 +1,11 @@
+try:
+    import zoneinfo
+except ImportError:
+    from backports import zoneinfo
+
 from datetime import datetime, timezone
 
 import pytest
-import pytz
 from dateutil import tz as dateutil_tz
 
 from arrow import (
@@ -124,7 +128,7 @@ def test_timezone(self):
     @pytest.mark.parametrize("full_tz_name", make_full_tz_list())
     def test_timezone_formatter(self, full_tz_name):
         # This test will fail if we use "now" as date as soon as we change from/to DST
-        dt = datetime(1986, 2, 14, tzinfo=pytz.timezone("UTC")).replace(
+        dt = datetime(1986, 2, 14, tzinfo=zoneinfo.ZoneInfo("UTC")).replace(
             tzinfo=dateutil_tz.gettz(full_tz_name)
         )
         abbreviation = dt.tzname()

tests/utils.py

@@ -1,11 +1,14 @@
-import pytz
+try:
+    import zoneinfo
+except ImportError:
+    from backports import zoneinfo
 from dateutil.zoneinfo import get_zonefile_instance
 
 
 def make_full_tz_list():
     dateutil_zones = set(get_zonefile_instance().zones)
-    pytz_zones = set(pytz.all_timezones)
-    return dateutil_zones.union(pytz_zones)
+    zoneinfo_zones = set(zoneinfo.available_timezones())
+    return dateutil_zones.union(zoneinfo_zones)
 
 
 def assert_datetime_equality(dt1, dt2, within=10):