diff --git a/swh/docs/sphinx/conf.py b/swh/docs/sphinx/conf.py
--- a/swh/docs/sphinx/conf.py
+++ b/swh/docs/sphinx/conf.py
@@ -114,6 +114,10 @@
     ]
 }
 
+# If not None, a 'Last updated on:' timestamp is inserted at every page
+# bottom, using the given strftime format.
+# The empty string is equivalent to '%b %d, %Y'.
+html_last_updated_fmt = "%Y-%m-%dT%H:%M:%S%z"
 
 # refer to the Python standard library.
 intersphinx_mapping = {'python': ('https://docs.python.org/3', None)}