diff --git a/bin/add-old-drafts-from-archive.py b/bin/add-old-drafts-from-archive.py
index e169ecdcf..5f7b37783 100755
--- a/bin/add-old-drafts-from-archive.py
+++ b/bin/add-old-drafts-from-archive.py
@@ -66,9 +66,9 @@ for name in sorted(names):
                     print name, rev, "Can't parse", p,":",e
                     continue
             if draft.errors and draft.errors.keys()!=['draftname',]:
-                print "Errors - could not process", name, rev, datetime.datetime.fromtimestamp(p.stat().st_mtime), draft.errors, draft.get_title().encode('utf8')
+                print "Errors - could not process", name, rev, datetime.datetime.fromtimestamp(p.stat().st_mtime, datetime.timezone.utc), draft.errors, draft.get_title().encode('utf8')
             else:
-                time = datetime.datetime.fromtimestamp(p.stat().st_mtime)
+                time = datetime.datetime.fromtimestamp(p.stat().st_mtime, datetime.timezone.utc)
                 if not doc:
                     doc = Document.objects.create(name=name,
                                                   time=time,
diff --git a/ietf/doc/models.py b/ietf/doc/models.py
index 4e2e8836d..56d03adca 100644
--- a/ietf/doc/models.py
+++ b/ietf/doc/models.py
@@ -962,7 +962,7 @@ class Document(DocumentInfo):
             elif rev_events.exists():
                 time = rev_events.first().time
             else:
-                time = datetime.datetime.fromtimestamp(0)
+                time = datetime.datetime.fromtimestamp(0, datetime.timezone.utc)
             dh = DocHistory(name=self.name, rev=rev, doc=self, time=time, type=self.type, title=self.title,
                              stream=self.stream, group=self.group)
 
diff --git a/ietf/review/mailarch.py b/ietf/review/mailarch.py
index 2ca6c9566..c21bc1fc8 100644
--- a/ietf/review/mailarch.py
+++ b/ietf/review/mailarch.py
@@ -89,7 +89,7 @@ def retrieve_messages_from_mbox(mbox_fileobj):
             utcdate = None
             d = email.utils.parsedate_tz(msg["Date"])
             if d:
-                utcdate = datetime.datetime.fromtimestamp(email.utils.mktime_tz(d))
+                utcdate = datetime.datetime.fromtimestamp(email.utils.mktime_tz(d), datetime.timezone.utc)
 
             res.append({
                 "from": msg["From"],
diff --git a/ietf/secr/proceedings/views.py b/ietf/secr/proceedings/views.py
index b08375176..8189519e9 100644
--- a/ietf/secr/proceedings/views.py
+++ b/ietf/secr/proceedings/views.py
@@ -304,7 +304,7 @@ def select(request, meeting_num):
     # get the time proceedings were generated
     path = os.path.join(settings.SECR_PROCEEDINGS_DIR,meeting.number,'index.html')
     if os.path.exists(path):
-        last_run = datetime.datetime.fromtimestamp(os.path.getmtime(path))
+        last_run = datetime.datetime.fromtimestamp(os.path.getmtime(path), datetime.timezone.utc)
     else:
         last_run = None