fix: Prevent microsecond drift when offsets are equal in e2e test

Author: nahua-aignx

tests/aignostics/platform/e2e_test.py

@@ -273,7 +273,9 @@ def _submit_and_validate(  # noqa: PLR0913, PLR0917
         ValueError: If more than one tag is provided.
     """
     tags = tags or set()
-    deadline = datetime.now(tz=UTC) + timedelta(seconds=deadline_seconds)
+    now = datetime.now(tz=UTC)
+    due_date = now + timedelta(seconds=due_date_seconds)
+    deadline = now + timedelta(seconds=deadline_seconds)
     find_and_validate_at = deadline + timedelta(hours=1)
     tags.add(
         f"find_and_validate:{find_and_validate_at.month}_{find_and_validate_at.day}_{find_and_validate_at.hour}"
@@ -282,7 +284,7 @@ def _submit_and_validate(  # noqa: PLR0913, PLR0917
     logger.trace(f"Submitting application run for {application_id} version {application_version}")
     client = platform.Client()
     scheduling = {
-        "due_date": (datetime.now(tz=UTC) + timedelta(seconds=due_date_seconds)).isoformat(),
+        "due_date": due_date.isoformat(),
         "deadline": deadline.isoformat(),
     }
     custom_metadata = {