diff --git a/swh/web/common/utils.py b/swh/web/common/utils.py
--- a/swh/web/common/utils.py
+++ b/swh/web/common/utils.py
@@ -158,7 +158,7 @@
     return re.sub(sha1_re, r"\1...", ret)
 
 
-def format_utc_iso_date(iso_date, fmt="%d %B %Y, %H:%M UTC"):
+def format_utc_iso_date(iso_date, fmt="%d %B %Y, %H:%M:%S UTC"):
     """Turns a string representation of an ISO 8601 datetime string
     to UTC and format it into a more human readable one.
 
diff --git a/swh/web/tests/common/test_utils.py b/swh/web/tests/common/test_utils.py
--- a/swh/web/tests/common/test_utils.py
+++ b/swh/web/tests/common/test_utils.py
@@ -87,7 +87,7 @@
 def test_format_utc_iso_date():
     assert (
         utils.format_utc_iso_date("2017-05-04T13:27:13+02:00")
-        == "04 May 2017, 11:27 UTC"
+        == "04 May 2017, 11:27:13 UTC"
     )