diff --git a/swh/provenance/model.py b/swh/provenance/model.py
--- a/swh/provenance/model.py
+++ b/swh/provenance/model.py
@@ -3,7 +3,7 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
-from datetime import datetime
+from datetime import datetime, timedelta, timezone
 from typing import Iterable, Iterator, List, Optional, Set
 
 from swh.core.utils import grouper
@@ -81,20 +81,26 @@
 
     def parents(self, archive: ArchiveInterface):
         if self._parents is None:
-            revision = archive.revision_get([self.id])
+            revision = list(archive.revision_get([self.id]))
             if revision:
-                self._parents = list(revision)[0].parents
+                self._parents = revision[0].parents
         if self._parents and not self._nodes:
-            self._nodes = [
-                RevisionEntry(
-                    id=rev.id,
-                    root=rev.directory,
-                    date=rev.date,
-                    parents=rev.parents,
-                )
-                for rev in archive.revision_get(self._parents)
-                if rev
-            ]
+            for rev in archive.revision_get(self._parents):
+                if rev is not None and rev.date is not None:
+                    date = datetime.fromtimestamp(
+                        rev.date.timestamp.seconds,
+                        timezone(timedelta(minutes=rev.date.offset)),
+                    )
+                    self._nodes.append(
+                        RevisionEntry(
+                            id=rev.id,
+                            root=rev.directory,
+                            date=date.replace(
+                                microsecond=rev.date.timestamp.microseconds
+                            ),
+                            parents=rev.parents,
+                        )
+                    )
         yield from self._nodes
 
     def __str__(self):