diff --git a/swh/web/api/views/release.py b/swh/web/api/views/release.py
--- a/swh/web/api/views/release.py
+++ b/swh/web/api/views/release.py
@@ -30,7 +30,7 @@
         {common_headers}
 
         :>json object author: information about the author of the release
-        :>json string date: ISO representation of the release date (in UTC)
+        :>json string date: RFC3339 representation of the release date
         :>json string id: the release unique identifier
         :>json string message: the message associated to the release
         :>json string name: the name of the release
diff --git a/swh/web/api/views/revision.py b/swh/web/api/views/revision.py
--- a/swh/web/api/views/revision.py
+++ b/swh/web/api/views/revision.py
@@ -15,9 +15,8 @@
         :>json object author: information about the author of the revision
         :>json object committer: information about the committer of the
             revision
-        :>json string committer_date: ISO representation of the commit date
-            (in UTC)
-        :>json string date: ISO representation of the revision date (in UTC)
+        :>json string committer_date: RFC3339 representation of the commit date
+        :>json string date: RFC3339 representation of the revision date
         :>json string directory: the unique identifier that revision points to
         :>json string directory_url: link to
             :http:get:`/api/1/directory/(sha1_git)/[(path)/]` to get
diff --git a/swh/web/tests/api/test_apidoc.py b/swh/web/tests/api/test_apidoc.py
--- a/swh/web/tests/api/test_apidoc.py
+++ b/swh/web/tests/api/test_apidoc.py
@@ -39,9 +39,8 @@
 
     :>json object author: information about the author of the revision
     :>json object committer: information about the committer of the revision
-    :>json string committer_date: ISO representation of the commit date
-        (in UTC)
-    :>json string date: ISO representation of the revision date (in UTC)
+    :>json string committer_date: RFC3339 representation of the commit date
+    :>json string date: RFC3339 representation of the revision date
     :>json string directory: the unique identifier that revision points to
     :>json string directory_url: link to
         :http:get:`/api/1/directory/(sha1_git)/[(path)/]` to get information
@@ -288,12 +287,12 @@
         {
             "name": "committer_date",
             "type": "string",
-            "doc": "ISO representation of the commit date (in UTC)",
+            "doc": "RFC3339 representation of the commit date",
         },
         {
             "name": "date",
             "type": "string",
-            "doc": "ISO representation of the revision date (in UTC)",
+            "doc": "RFC3339 representation of the revision date",
         },
         {
             "name": "directory",