diff --git a/Doc/conf.py b/Doc/conf.py
index 8c92799ecbbf3b..3f5ba5d969d313 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -280,9 +280,8 @@
     "pr_id": os.getenv("READTHEDOCS_VERSION")
 }
 
-# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
-# using the given strftime format.
-html_last_updated_fmt = '%b %d, %Y'
+# This 'Last updated on:' timestamp is inserted at the bottom of every page.
+html_last_updated_fmt = time.strftime('%b %d, %Y (%H:%M UTC)', time.gmtime())
 
 # Path to find HTML templates.
 templates_path = ['tools/templates']