Fix DeprecationWarning: datetime.datetime.utcfromtimestamp() is deprecated and scheduled for removal in a future version. (#1261)

* Fix DeprecationWarning: datetime.datetime.utcfromtimestamp() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.fromtimestamp(timestamp, datetime.UTC)

* Update release notes and bumped the version

* Fix CI issue realated to actions/setup-python#962

Author: shcherbin

.github/workflows/test.yaml

@@ -8,10 +8,10 @@ on:
 jobs:
   test:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', 'pypy-3.8']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11' ,'3.12', 'pypy-3.8']
 
     steps:
     - uses: actions/checkout@v2

docs/release_notes.rst

@@ -3,6 +3,13 @@
 Release Notes
 =============
 
+v6.0.2
+------
+
+Fixes:
+
+* Fix a warning about `datetime.utcfromtimestamp` deprecation (:pr:`1261`)
+
 v6.0.1
 ------
 

pynamodb/__init__.py

@@ -7,4 +7,4 @@
 """
 __author__ = 'Jharrod LaFon'
 __license__ = 'MIT'
-__version__ = '6.0.1'
+__version__ = '6.0.2'

pynamodb/attributes.py

@@ -825,7 +825,7 @@ def _normalize(self, value):
             value = calendar.timegm(value.utctimetuple())
         else:
             raise ValueError("TTLAttribute value must be a timedelta or datetime")
-        return datetime.utcfromtimestamp(value).replace(tzinfo=timezone.utc)
+        return datetime.fromtimestamp(value, tz=timezone.utc)
 
     def __set__(self, instance, value):
         """
@@ -846,7 +846,7 @@ def deserialize(self, value):
         Deserializes a timestamp (Unix time) as a UTC datetime.
         """
         timestamp = json.loads(value)
-        return datetime.utcfromtimestamp(timestamp).replace(tzinfo=timezone.utc)
+        return datetime.fromtimestamp(timestamp, tz=timezone.utc)
 
 
 class UTCDateTimeAttribute(Attribute[datetime]):

setup.py

@@ -33,6 +33,8 @@
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
         'License :: OSI Approved :: MIT License',
     ],
     extras_require={