[junitxml] add timezone to testsuite timestamp

AUTHORS

@@ -213,6 +213,7 @@ Jordan Guymon
 Jordan Moldow
 Jordan Speicher
 Joseph Hunkeler
+Joseph Sawaya
 Josh Karpel
 Joshua Bronson
 Jurko Gospodnetić

changelog/7662.improvement.rst

@@ -0,0 +1 @@
+Added timezone information to the testsuite timestamp in the JUnit XML report.

src/_pytest/junitxml.py

@@ -11,6 +11,7 @@
 from __future__ import annotations
 
 from datetime import datetime
+from datetime import timezone
 import functools
 import os
 import platform
@@ -664,7 +665,9 @@ def pytest_sessionfinish(self) -> None:
                 skipped=str(self.stats["skipped"]),
                 tests=str(numtests),
                 time=f"{suite_time_delta:.3f}",
-                timestamp=datetime.fromtimestamp(self.suite_start_time).isoformat(),
+                timestamp=datetime.fromtimestamp(self.suite_start_time, timezone.utc)
+                .astimezone()
+                .isoformat(),
                 hostname=platform.node(),
             )
             global_properties = self._get_global_properties_node()

testing/test_junitxml.py

@@ -2,6 +2,7 @@
 from __future__ import annotations
 
 from datetime import datetime
+from datetime import timezone
 import os
 from pathlib import Path
 import platform
@@ -218,11 +219,11 @@ def test_pass():
                 pass
         """
         )
-        start_time = datetime.now()
+        start_time = datetime.now(timezone.utc)
         result, dom = run_and_parse(family=xunit_family)
         node = dom.find_first_by_tag("testsuite")
-        timestamp = datetime.strptime(node["timestamp"], "%Y-%m-%dT%H:%M:%S.%f")
-        assert start_time <= timestamp < datetime.now()
+        timestamp = datetime.strptime(node["timestamp"], "%Y-%m-%dT%H:%M:%S.%f%z")
+        assert start_time <= timestamp < datetime.now(timezone.utc)
 
     def test_timing_function(
         self, pytester: Pytester, run_and_parse: RunAndParse, mock_timing