Switch to zoneinfo from pytz (#7645)

* switch to zoneinfo from pytz

* fix lookup

* fix assert

* fix another round of assertions

src/backend/InvenTree/InvenTree/helpers.py

@@ -22,9 +22,10 @@ from django.utils import timezone
 from django.utils.translation import gettext_lazy as _
 
 import bleach
-import pytz
 from bleach import clean
 from djmoney.money import Money
+from PIL import Image
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 from common.currency import currency_code_default
 
@@ -138,8 +139,6 @@ def getStaticUrl(filename):
 
 def TestIfImage(img):
     """Test if an image file is indeed an image."""
-    from PIL import Image
-
     try:
         Image.open(img).verify()
         return True
@@ -962,15 +961,15 @@ def to_local_time(time, target_tz: Optional[str] = None):
 
     if not source_tz:
         # Default to UTC if not provided
-        source_tz = pytz.utc
+        source_tz = ZoneInfo('UTC')
 
     if not target_tz:
         target_tz = server_timezone()
 
     try:
-        target_tz = pytz.timezone(str(target_tz))
-    except pytz.UnknownTimeZoneError:
-        target_tz = pytz.utc
+        target_tz = ZoneInfo(str(target_tz))
+    except ZoneInfoNotFoundError:
+        target_tz = ZoneInfo('UTC')
 
     target_time = time.replace(tzinfo=source_tz).astimezone(target_tz)
 

src/backend/InvenTree/InvenTree/settings.py

@@ -19,9 +19,9 @@ import django.core.exceptions
 from django.core.validators import URLValidator
 from django.http import Http404
 
-import pytz
 import structlog
 from dotenv import load_dotenv
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 
 from InvenTree.cache import get_cache_config, is_global_cache_enabled
 from InvenTree.config import get_boolean_setting, get_custom_file, get_setting
@@ -1040,8 +1040,8 @@ TIME_ZONE = get_setting('INVENTREE_TIMEZONE', 'timezone', 'UTC')
 
 # Check that the timezone is valid
 try:
-    pytz.timezone(TIME_ZONE)
-except pytz.exceptions.UnknownTimeZoneError:  # pragma: no cover
+    ZoneInfo(TIME_ZONE)
+except ZoneInfoNotFoundError:  # pragma: no cover
     raise ValueError(f"Specified timezone '{TIME_ZONE}' is not valid")
 
 USE_I18N = True

src/backend/InvenTree/InvenTree/tests.py

@@ -16,12 +16,12 @@ from django.urls import reverse
 from django.utils import timezone
 
 import pint.errors
-import pytz
 from djmoney.contrib.exchange.exceptions import MissingRate
 from djmoney.contrib.exchange.models import Rate, convert_money
 from djmoney.money import Money
 from maintenance_mode.core import get_maintenance_mode, set_maintenance_mode
 from sesame.utils import get_user
+from zoneinfo import ZoneInfo
 
 import InvenTree.conversion
 import InvenTree.format
@@ -736,14 +736,14 @@ class TestTimeFormat(TestCase):
             month=1,
             day=1,
             hour=0,
-            minute=0,
+            minute=1,
             second=0,
-            tzinfo=pytz.timezone('Europe/London'),
+            tzinfo=ZoneInfo('Europe/London'),
         )
 
         tests = [
             ('UTC', '2000-01-01 00:01:00+00:00'),
-            ('Europe/London', '2000-01-01 00:00:00-00:01'),
+            ('Europe/London', '2000-01-01 00:01:00+00:00'),
             ('America/New_York', '1999-12-31 19:01:00-05:00'),
             # All following tests should result in the same value
             ('Australia/Sydney', '2000-01-01 11:01:00+11:00'),

src/backend/InvenTree/report/tests.py

@@ -10,8 +10,8 @@ from django.urls import reverse
 from django.utils import timezone
 from django.utils.safestring import SafeString
 
-import pytz
 from PIL import Image
+from zoneinfo import ZoneInfo
 
 import report.models as report_models
 from build.models import Build
@@ -182,17 +182,17 @@ class ReportTagTest(TestCase):
             hour=12,
             minute=30,
             second=0,
-            tzinfo=pytz.timezone('Australia/Sydney'),
+            tzinfo=ZoneInfo('Australia/Sydney'),
         )
 
         # Format a set of tests: timezone, format, expected
         tests = [
-            (None, None, '2024-03-12T22:25:00-04:00'),
+            (None, None, '2024-03-12T21:30:00-04:00'),
             (None, '%d-%m-%y', '12-03-24'),
-            ('UTC', None, '2024-03-13T02:25:00+00:00'),
+            ('UTC', None, '2024-03-13T01:30:00+00:00'),
             ('UTC', '%d-%B-%Y', '13-March-2024'),
-            ('Europe/Amsterdam', None, '2024-03-13T03:25:00+01:00'),
-            ('Europe/Amsterdam', '%y-%m-%d %H:%M', '24-03-13 03:25'),
+            ('Europe/Amsterdam', None, '2024-03-13T02:30:00+01:00'),
+            ('Europe/Amsterdam', '%y-%m-%d %H:%M', '24-03-13 02:30'),
         ]
 
         for tz, fmt, expected in tests: