Use backwards-compatible datetime.timezone.utc

* Fail builds on test failure

* Deliberately fail a build to test

* Revert "Deliberately fail a build to test"

This reverts commit 666140a954.

.github/workflows/python-package.yml

@@ -40,7 +40,9 @@ jobs:
     - name: Safety checks
       run: safety check
     - name: Test with pytest and coverage
-      run: pytest --junitxml=pytest.xml --cov-report=term-missing:skip-covered --cov=mvt tests/ | tee pytest-coverage.txt
+      run: |
+        set -o pipefail
+        pytest --junitxml=pytest.xml --cov-report=term-missing:skip-covered --cov=mvt tests/ | tee pytest-coverage.txt
     - name: Pytest coverage comment
       continue-on-error: true # Workflows running on a fork can't post comments
       uses: MishaKav/pytest-coverage-comment@main

mvt/common/utils.py

@@ -59,13 +59,10 @@ def convert_datetime_to_iso(date_time: datetime.datetime) -> str:
     :rtype: str
 
     """
-    try:
-        if date_time.tzinfo:
-            # Timezone aware object - convert to UTC
-            date_time = date_time.astimezone(tz=datetime.UTC)
-        return date_time.strftime("%Y-%m-%d %H:%M:%S.%f")
-    except Exception:
-        return ""
+    if date_time.tzinfo:
+        # Timezone aware object - convert to UTC
+        date_time = date_time.astimezone(tz=datetime.timezone.utc)
+    return date_time.strftime("%Y-%m-%d %H:%M:%S.%f")
 
 
 def convert_unix_to_utc_datetime(