diff --git a/api-ref/source/v2/agents.inc b/api-ref/source/v2/agents.inc
index 8b7108e32..2bec2b194 100644
--- a/api-ref/source/v2/agents.inc
+++ b/api-ref/source/v2/agents.inc
@@ -41,7 +41,7 @@ Response Parameters
    - alive: alive
    - binary: binary
    - configurations: configurations
-   - created_at: created_at
+   - created_at: created_at_resource
    - description: description
    - heartbeat_timestamp: heartbeat_timestamp
    - host: host
@@ -86,7 +86,7 @@ Response Parameters
    - alive: alive
    - binary: binary
    - configurations: configurations
-   - created_at: created_at
+   - created_at: created_at_resource
    - description: description
    - heartbeat_timestamp: heartbeat_timestamp
    - host: host
@@ -138,7 +138,7 @@ Response Parameters
    - alive: alive
    - binary: binary
    - configurations: configurations
-   - created_at: created_at
+   - created_at: created_at_resource
    - description: description
    - heartbeat_timestamp: heartbeat_timestamp
    - host: host
diff --git a/api-ref/source/v2/floatingips.inc b/api-ref/source/v2/floatingips.inc
index fe4300806..1a05c68a9 100644
--- a/api-ref/source/v2/floatingips.inc
+++ b/api-ref/source/v2/floatingips.inc
@@ -17,6 +17,12 @@ The ``fip-port-details`` extension adds the ``port_details`` attribute to
 floating IPs. The value of this attribute contains information of the
 associated port.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 List floating IPs
 =================
 
diff --git a/api-ref/source/v2/logging.inc b/api-ref/source/v2/logging.inc
index 863fb24b4..104055859 100644
--- a/api-ref/source/v2/logging.inc
+++ b/api-ref/source/v2/logging.inc
@@ -7,6 +7,12 @@ Log resource
 The ``logging`` extension lists, creates, shows information for, and updates
 log resource.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 List logs
 =========
 
@@ -54,6 +60,7 @@ Response Parameters
    - logs: logs
    - id: log_id
    - name: name
+   - created_at: created_at_resource
    - description: description
    - tenant_id: project_id
    - project_id: project_id
@@ -62,6 +69,7 @@ Response Parameters
    - resource_type: resource_log_type
    - resource_id: resource_log_id
    - target_id: resource_target_log_id
+   - updated_at: updated_at_resource
    - enabled: log_enabled
 
 Response Example
@@ -122,6 +130,7 @@ Response Parameters
    - log: log
    - id: log_id
    - name: name
+   - created_at: created_at_resource
    - description: description
    - tenant_id: project_id
    - project_id: project_id
@@ -130,6 +139,7 @@ Response Parameters
    - resource_type: resource_log_type
    - resource_id: resource_log_id
    - target_id: resource_target_log_id
+   - updated_at: updated_at_resource
    - enabled: log_enabled
 
 Request Example
@@ -164,6 +174,7 @@ Response Parameters
    - log: log
    - id: log_id
    - name: name
+   - created_at: created_at_resource
    - description: description
    - tenant_id: project_id
    - project_id: project_id
@@ -172,6 +183,7 @@ Response Parameters
    - resource_type: resource_log_type
    - resource_id: resource_log_id
    - target_id: resource_target_log_id
+   - updated_at: updated_at_resource
    - enabled: log_enabled
 
 Response Example
@@ -216,6 +228,7 @@ Response Parameters
    - log: log
    - id: log_id
    - name: name
+   - created_at: created_at_resource
    - description: description
    - tenant_id: project_id
    - project_id: project_id
@@ -224,6 +237,7 @@ Response Parameters
    - resource_type: resource_log_type
    - resource_id: resource_log_id
    - target_id: resource_target_log_id
+   - updated_at: updated_at_resource
    - enabled: log_enabled
 
 Response Example
diff --git a/api-ref/source/v2/parameters.yaml b/api-ref/source/v2/parameters.yaml
index 1ca384546..cadd34807 100644
--- a/api-ref/source/v2/parameters.yaml
+++ b/api-ref/source/v2/parameters.yaml
@@ -1676,12 +1676,6 @@ connection_limit-response:
   in: body
   required: true
   type: integer
-created_at:
-  description: |
-    Time at which the resource was created.
-  in: body
-  required: true
-  type: string
 created_at_resource:
   description: |
     Time at which the resource has been created (in UTC ISO8601 format).
@@ -4996,12 +4990,6 @@ subnet-allocation_pools-request:
   in: body
   required: false
   type: array
-subnet-created_at:
-  description: |
-    Time at which the subnet has been created.
-  in: body
-  required: true
-  type: string
 subnet-dns_nameservers:
   description: |
     List of dns name servers associated with the subnet.
@@ -5178,12 +5166,6 @@ subnet-subnetpool_id-request:
   in: body
   required: false
   type: string
-subnet-updated_at:
-  description: |
-    Time at which the subnet has been updated.
-  in: body
-  required: true
-  type: string
 subnet_id:
   description: |
     If you specify only a subnet UUID, OpenStack
@@ -5320,12 +5302,6 @@ updated:
   in: body
   required: true
   type: string
-updated_at:
-  description: |
-    Time at which port has been updated.
-  in: body
-  required: true
-  type: string
 updated_at_resource:
   description: |
     Time at which the resource has been updated (in UTC ISO8601 format).
diff --git a/api-ref/source/v2/ports.inc b/api-ref/source/v2/ports.inc
index edfabff32..2bc59b1ce 100644
--- a/api-ref/source/v2/ports.inc
+++ b/api-ref/source/v2/ports.inc
@@ -88,6 +88,12 @@ attribute to ports. If a ``port-security`` value is not specified during
 port creation, a port will inherit the ``port_security_enabled`` from the
 network its connected to.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 Show port details
 =================
 
@@ -126,7 +132,7 @@ Response Parameters
    - binding:vif_details: binding:vif_details
    - binding:vif_type: binding:vif_type
    - binding:vnic_type: binding:vnic_type
-   - created_at: created_at
+   - created_at: created_at_resource
    - data_plane_status: data_plane_status
    - description: description
    - device_id: device_id
@@ -147,7 +153,7 @@ Response Parameters
    - security_groups: port-security_groups
    - status: port-status
    - tenant_id: project_id
-   - updated_at: updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -243,7 +249,7 @@ Response Parameters
    - binding:vif_details: binding:vif_details
    - binding:vif_type: binding:vif_type
    - binding:vnic_type: binding:vnic_type
-   - created_at: created_at
+   - created_at: created_at_resource
    - data_plane_status: data_plane_status
    - description: description
    - device_id: device_id
@@ -264,7 +270,7 @@ Response Parameters
    - security_groups: port-security_groups
    - status: port-status
    - tenant_id: project_id
-   - updated_at: updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -372,7 +378,7 @@ Response Parameters
    - binding:vif_details: binding:vif_details
    - binding:vif_type: binding:vif_type
    - binding:vnic_type: binding:vnic_type
-   - created_at: created_at
+   - created_at: created_at_resource
    - data_plane_status: data_plane_status
    - description: description
    - device_id: device_id
@@ -393,7 +399,7 @@ Response Parameters
    - security_groups: port-security_groups
    - status: port-status
    - tenant_id: project_id
-   - updated_at: updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -472,7 +478,7 @@ Response Parameters
    - binding:vif_details: binding:vif_details
    - binding:vif_type: binding:vif_type
    - binding:vnic_type: binding:vnic_type
-   - created_at: created_at
+   - created_at: created_at_resource
    - data_plane_status: data_plane_status
    - description: description
    - device_id: device_id
@@ -493,7 +499,7 @@ Response Parameters
    - security_groups: port-security_groups
    - status: port-status
    - tenant_id: project_id
-   - updated_at: updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -565,7 +571,7 @@ Response Parameters
    - binding:vif_details: binding:vif_details
    - binding:vif_type: binding:vif_type
    - binding:vnic_type: binding:vnic_type
-   - created_at: created_at
+   - created_at: created_at_resource
    - data_plane_status: data_plane_status
    - description: description
    - device_id: device_id
@@ -586,7 +592,7 @@ Response Parameters
    - security_groups: port-security_groups
    - status: port-status
    - tenant_id: project_id
-   - updated_at: updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
diff --git a/api-ref/source/v2/qos.inc b/api-ref/source/v2/qos.inc
index 5db625e34..0fc4d373d 100644
--- a/api-ref/source/v2/qos.inc
+++ b/api-ref/source/v2/qos.inc
@@ -90,6 +90,12 @@ QoS policies (qos)
 
 Lists, creates, deletes, shows information for, and updates QoS policies.
 
+Resource timestamps extension
+=============================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 QoS default extension
 =====================
 The QoS default extension (``qos-default``) allows a per project
@@ -152,6 +158,8 @@ Response Parameters
    - is_default: qos_is_default
    - rules: qos-rules
    - name: name
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -215,6 +223,8 @@ Response Parameters
    - id: qos_policy_id
    - is_default: qos_is_default
    - name: name
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -255,6 +265,8 @@ Response Parameters
    - id: qos_policy_id
    - is_default: qos_is_default
    - name: name
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -309,6 +321,8 @@ Response Parameters
    - is_default: qos_is_default
    - rules: qos-rules
    - name: name
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
diff --git a/api-ref/source/v2/routers.inc b/api-ref/source/v2/routers.inc
index 4d48138dc..0b4297659 100644
--- a/api-ref/source/v2/routers.inc
+++ b/api-ref/source/v2/routers.inc
@@ -36,6 +36,12 @@ The router flavor extension (``l3-flavors``) adds the ``flavor_id`` attribute
 to routers, allowing requests to be dispatched to different drivers depending
 on the flavor associated with a given router.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 Router availability zone extension
 ==================================
 
@@ -120,6 +126,8 @@ Response Parameters
    - availability_zones: router-availability_zones
    - service_type_id: router-service_type_id
    - flavor_id: router-flavor_id
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -202,6 +210,8 @@ Response Parameters
    - availability_zones: router-availability_zones
    - service_type_id: router-service_type_id
    - flavor_id: router-flavor_id
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -261,6 +271,8 @@ Response Parameters
    - availability_zones: router-availability_zones
    - service_type_id: router-service_type_id
    - flavor_id: router-flavor_id
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -333,6 +345,8 @@ Response Parameters
    - availability_zones: router-availability_zones
    - service_type_id: router-service_type_id
    - flavor_id: router-flavor_id
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
diff --git a/api-ref/source/v2/samples/logs/log-create-response.json b/api-ref/source/v2/samples/logs/log-create-response.json
index f9ea42456..7d73a23dc 100644
--- a/api-ref/source/v2/samples/logs/log-create-response.json
+++ b/api-ref/source/v2/samples/logs/log-create-response.json
@@ -5,6 +5,8 @@
         "id": "46ebaec0-0570-43ac-82f6-60d2b03168c4",
         "project_id": "92a5a4f4245a4abbafacb7ca73b027b0",
         "tenant_id": "92a5a4f4245a4abbafacb7ca73b027b0",
+        "created_at": "2018-04-03T21:03:04Z",
+        "updated_at": "2018-04-03T21:03:04Z",
         "enabled": true,
         "resource_type": "security_group",
         "resource_id": null,
diff --git a/api-ref/source/v2/samples/logs/log-list-response.json b/api-ref/source/v2/samples/logs/log-list-response.json
index 5f89c90d8..533510876 100644
--- a/api-ref/source/v2/samples/logs/log-list-response.json
+++ b/api-ref/source/v2/samples/logs/log-list-response.json
@@ -6,6 +6,8 @@
             "id": "46ebaec0-0570-43ac-82f6-60d2b03168c4",
             "project_id": "92a5a4f4245a4abbafacb7ca73b027b0",
             "tenant_id": "92a5a4f4245a4abbafacb7ca73b027b0",
+            "created_at": "2018-04-03T21:03:04Z",
+            "updated_at": "2018-04-03T21:03:04Z",
             "enabled": true,
             "revision_number": 1,
             "resource_type": "security_group",
diff --git a/api-ref/source/v2/samples/logs/log-show-response.json b/api-ref/source/v2/samples/logs/log-show-response.json
index 0cdc87e8d..ab91caf09 100644
--- a/api-ref/source/v2/samples/logs/log-show-response.json
+++ b/api-ref/source/v2/samples/logs/log-show-response.json
@@ -5,6 +5,8 @@
         "id": "46ebaec0-0570-43ac-82f6-60d2b03168c4",
         "project_id": "8d4c70a21fed4aeba121a1a429ba0d04",
         "tenant_id": "8d4c70a21fed4aeba121a1a429ba0d04",
+        "created_at": "2018-04-03T21:03:04Z",
+        "updated_at": "2018-04-03T21:03:04Z",
         "enabled": true,
         "revision_number": 1,
         "resource_type": "security_group",
diff --git a/api-ref/source/v2/samples/logs/log-update-response.json b/api-ref/source/v2/samples/logs/log-update-response.json
index e02a8b156..2472069e2 100644
--- a/api-ref/source/v2/samples/logs/log-update-response.json
+++ b/api-ref/source/v2/samples/logs/log-update-response.json
@@ -5,6 +5,8 @@
         "id": "46ebaec0-0570-43ac-82f6-60d2b03168c4",
         "project_id": "8d4c70a21fed4aeba121a1a429ba0d04",
         "tenant_id": "8d4c70a21fed4aeba121a1a429ba0d04",
+        "created_at": "2018-04-03T21:03:04Z",
+        "updated_at": "2018-04-03T21:03:04Z",
         "enabled": false,
         "revision_number": 3,
         "resource_type": "security_group",
diff --git a/api-ref/source/v2/samples/ports/port-bind-create-response.json b/api-ref/source/v2/samples/ports/port-bind-create-response.json
index 6a5b4268b..ccc3ee748 100644
--- a/api-ref/source/v2/samples/ports/port-bind-create-response.json
+++ b/api-ref/source/v2/samples/ports/port-bind-create-response.json
@@ -20,6 +20,7 @@
         "binding:vif_details": {},
         "binding:vif_type": "unbound",
         "binding:vnic_type": "other",
+        "created_at": "2016-03-08T20:19:41",
         "data_plane_status": null,
         "description": "",
         "device_id": "d90a13da-be41-461f-9f99-1dbcf438fdf2",
@@ -56,6 +57,7 @@
         ],
         "status": "DOWN",
         "tenant_id": "d6700c0c9ffa4f1cb322cd4a1f3906fa",
+        "updated_at": "2016-03-08T20:19:41",
         "port_security_enabled": true
     }
 }
diff --git a/api-ref/source/v2/samples/ports/port-bind-update-response.json b/api-ref/source/v2/samples/ports/port-bind-update-response.json
index 77fe92940..93a544c28 100644
--- a/api-ref/source/v2/samples/ports/port-bind-update-response.json
+++ b/api-ref/source/v2/samples/ports/port-bind-update-response.json
@@ -7,6 +7,7 @@
         "binding:vif_details": {},
         "binding:vif_type": "binding_failed",
         "binding:vnic_type": "normal",
+        "created_at": "2016-03-08T20:19:41",
         "data_plane_status": "DOWN",
         "description": "",
         "device_id": "d90a13da-be41-461f-9f99-1dbcf438fdf2",
@@ -43,6 +44,7 @@
         ],
         "status": "DOWN",
         "tenant_id": "522eda8d23124b25bf03fe44f1986b74",
+        "updated_at": "2016-03-08T20:19:41",
         "port_security_enabled": false
     }
 }
diff --git a/api-ref/source/v2/samples/ports/port-update-response.json b/api-ref/source/v2/samples/ports/port-update-response.json
index 7ff4cf2a2..a1eeea0e8 100644
--- a/api-ref/source/v2/samples/ports/port-update-response.json
+++ b/api-ref/source/v2/samples/ports/port-update-response.json
@@ -7,6 +7,7 @@
         "binding:vif_details": {},
         "binding:vif_type": "binding_failed",
         "binding:vnic_type": "normal",
+        "created_at": "2016-03-08T20:19:41",
         "data_plane_status": "ACTIVE",
         "description": "",
         "device_id": "d90a13da-be41-461f-9f99-1dbcf438fdf2",
@@ -43,6 +44,7 @@
         ],
         "status": "DOWN",
         "tenant_id": "522eda8d23124b25bf03fe44f1986b74",
+        "updated_at": "2016-03-08T20:19:41",
         "port_security_enabled": false
     }
 }
diff --git a/api-ref/source/v2/samples/ports/ports-bind-list-response.json b/api-ref/source/v2/samples/ports/ports-bind-list-response.json
index 6c9de4ec8..775133b03 100644
--- a/api-ref/source/v2/samples/ports/ports-bind-list-response.json
+++ b/api-ref/source/v2/samples/ports/ports-bind-list-response.json
@@ -11,6 +11,7 @@
             },
             "binding:vif_type": "ovs",
             "binding:vnic_type": "normal",
+            "created_at": "2016-03-08T20:19:41",
             "data_plane_status": null,
             "description": "",
             "device_id": "9ae135f4-b6e0-4dad-9e91-3c223e385824",
@@ -39,7 +40,8 @@
             "revision_number": 1,
             "security_groups": [],
             "status": "ACTIVE",
-            "tenant_id": ""
+            "tenant_id": "",
+            "updated_at": "2016-03-08T20:19:41"
         },
         {
             "admin_state_up": true,
@@ -52,6 +54,7 @@
             },
             "binding:vif_type": "ovs",
             "binding:vnic_type": "normal",
+            "created_at": "2016-03-08T20:19:41",
             "data_plane_status": null,
             "description": "",
             "device_id": "9ae135f4-b6e0-4dad-9e91-3c223e385824",
@@ -80,7 +83,8 @@
             "revision_number": 2,
             "security_groups": [],
             "status": "ACTIVE",
-            "tenant_id": "d397de8a63f341818f198abb0966f6f3"
+            "tenant_id": "d397de8a63f341818f198abb0966f6f3",
+            "updated_at": "2016-03-08T20:19:41"
         }
     ]
 }
diff --git a/api-ref/source/v2/samples/ports/ports-bulk-create-response.json b/api-ref/source/v2/samples/ports/ports-bulk-create-response.json
index 3946d3b29..dbdab867c 100644
--- a/api-ref/source/v2/samples/ports/ports-bulk-create-response.json
+++ b/api-ref/source/v2/samples/ports/ports-bulk-create-response.json
@@ -3,6 +3,7 @@
         {
             "admin_state_up": false,
             "allowed_address_pairs": [],
+            "created_at": "2016-03-08T20:19:41",
             "data_plane_status": null,
             "description": "",
             "device_id": "",
@@ -34,11 +35,13 @@
             ],
             "status": "DOWN",
             "tenant_id": "d6700c0c9ffa4f1cb322cd4a1f3906fa",
+            "updated_at": "2016-03-08T20:19:41",
             "port_security_enabled": false
         },
         {
             "admin_state_up": false,
             "allowed_address_pairs": [],
+            "created_at": "2016-03-08T20:19:41",
             "data_plane_status": null,
             "description": "",
             "device_id": "",
@@ -71,6 +74,7 @@
             ],
             "status": "DOWN",
             "tenant_id": "d6700c0c9ffa4f1cb322cd4a1f3906fa",
+            "updated_at": "2016-03-08T20:19:41",
             "port_security_enabled": false
         }
     ]
diff --git a/api-ref/source/v2/samples/ports/ports-list-response.json b/api-ref/source/v2/samples/ports/ports-list-response.json
index 8352797d0..887d8d557 100644
--- a/api-ref/source/v2/samples/ports/ports-list-response.json
+++ b/api-ref/source/v2/samples/ports/ports-list-response.json
@@ -3,6 +3,7 @@
         {
             "admin_state_up": true,
             "allowed_address_pairs": [],
+            "created_at": "2016-03-08T20:19:41",
             "data_plane_status": null,
             "description": "",
             "device_id": "9ae135f4-b6e0-4dad-9e91-3c223e385824",
@@ -37,11 +38,13 @@
             "security_groups": [],
             "status": "ACTIVE",
             "tenant_id": "",
+            "updated_at": "2016-03-08T20:19:41",
             "port_security_enabled": false
         },
         {
             "admin_state_up": true,
             "allowed_address_pairs": [],
+            "created_at": "2016-03-08T20:19:41",
             "data_plane_status": null,
             "description": "",
             "device_id": "9ae135f4-b6e0-4dad-9e91-3c223e385824",
@@ -76,6 +79,7 @@
             "security_groups": [],
             "status": "ACTIVE",
             "tenant_id": "d397de8a63f341818f198abb0966f6f3",
+            "updated_at": "2016-03-08T20:19:41",
             "port_security_enabled": false
         }
     ]
diff --git a/api-ref/source/v2/samples/qos/policies-list-response.json b/api-ref/source/v2/samples/qos/policies-list-response.json
index f3f4578c7..a856cf73d 100644
--- a/api-ref/source/v2/samples/qos/policies-list-response.json
+++ b/api-ref/source/v2/samples/qos/policies-list-response.json
@@ -8,6 +8,8 @@
             "name": "10Mbit",
             "description": "This policy limits the ports to 10Mbit max.",
             "revision_number": 3,
+            "created_at": "2018-04-03T21:26:39Z",
+            "updated_at": "2018-04-03T21:26:39Z",
             "shared": false,
             "rules": [
                 {
diff --git a/api-ref/source/v2/samples/qos/policy-create-response.json b/api-ref/source/v2/samples/qos/policy-create-response.json
index 77f81c14e..6d5d15c81 100644
--- a/api-ref/source/v2/samples/qos/policy-create-response.json
+++ b/api-ref/source/v2/samples/qos/policy-create-response.json
@@ -8,6 +8,8 @@
         "project_id": "8d4c70a21fed4aeba121a1a429ba0d04",
         "revision_number": 1,
         "tenant_id": "8d4c70a21fed4aeba121a1a429ba0d04",
+        "created_at": "2018-04-03T21:26:39Z",
+        "updated_at": "2018-04-03T21:26:39Z",
         "shared": false
     }
 }
diff --git a/api-ref/source/v2/samples/qos/policy-show-response.json b/api-ref/source/v2/samples/qos/policy-show-response.json
index ef1bd60b5..cb4dbfd38 100644
--- a/api-ref/source/v2/samples/qos/policy-show-response.json
+++ b/api-ref/source/v2/samples/qos/policy-show-response.json
@@ -7,6 +7,8 @@
         "name": "10Mbit",
         "description": "This policy limits the ports to 10Mbit max.",
         "revision_number": 3,
+        "created_at": "2018-04-03T21:26:39Z",
+        "updated_at": "2018-04-03T21:26:39Z",
         "shared": false,
         "rules": [
             {
diff --git a/api-ref/source/v2/samples/qos/policy-update-response.json b/api-ref/source/v2/samples/qos/policy-update-response.json
index cd44f8ffa..c8fbb3b86 100644
--- a/api-ref/source/v2/samples/qos/policy-update-response.json
+++ b/api-ref/source/v2/samples/qos/policy-update-response.json
@@ -6,6 +6,8 @@
         "is_default": false,
         "project_id": "8d4c70a21fed4aeba121a1a429ba0d04",
         "revision_number": 3,
+        "created_at": "2018-04-03T21:26:39Z",
+        "updated_at": "2018-04-03T21:26:39Z",
         "tenant_id": "8d4c70a21fed4aeba121a1a429ba0d04",
         "shared": false
     }
diff --git a/api-ref/source/v2/samples/routers/router-create-response.json b/api-ref/source/v2/samples/routers/router-create-response.json
index ee8a7278a..24b0831df 100644
--- a/api-ref/source/v2/samples/routers/router-create-response.json
+++ b/api-ref/source/v2/samples/routers/router-create-response.json
@@ -5,6 +5,7 @@
         "availability_zones": [
             "nova"
         ],
+        "created_at": "2018-03-19T19:17:04Z",
         "description": "",
         "distributed": false,
         "external_gateway_info": {
@@ -24,6 +25,7 @@
         "routes": [],
         "revision_number": 1,
         "status": "ACTIVE",
+        "updated_at": "2018-03-19T19:17:22Z",
         "project_id": "0bd18306d801447bb457a46252d82d13",
         "tenant_id": "0bd18306d801447bb457a46252d82d13",
         "service_type_id": null
diff --git a/api-ref/source/v2/samples/routers/router-show-response.json b/api-ref/source/v2/samples/routers/router-show-response.json
index dc93bb24d..28f0eff51 100644
--- a/api-ref/source/v2/samples/routers/router-show-response.json
+++ b/api-ref/source/v2/samples/routers/router-show-response.json
@@ -5,6 +5,7 @@
         "availability_zones": [
             "nova"
         ],
+        "created_at": "2018-03-19T19:17:04Z",
         "description": "",
         "distributed": false,
         "external_gateway_info": {
@@ -33,6 +34,7 @@
             }
         ],
         "status": "ACTIVE",
+        "updated_at": "2018-03-19T19:17:22Z",
         "project_id": "0bd18306d801447bb457a46252d82d13",
         "tenant_id": "0bd18306d801447bb457a46252d82d13",
         "service_type_id": null
diff --git a/api-ref/source/v2/samples/routers/router-update-response.json b/api-ref/source/v2/samples/routers/router-update-response.json
index 003791c57..e052259a2 100644
--- a/api-ref/source/v2/samples/routers/router-update-response.json
+++ b/api-ref/source/v2/samples/routers/router-update-response.json
@@ -5,6 +5,7 @@
         "availability_zones": [
             "nova"
         ],
+        "created_at": "2018-03-19T19:17:04Z",
         "description": "",
         "distributed": false,
         "external_gateway_info": {
@@ -29,6 +30,7 @@
             }
         ],
         "status": "ACTIVE",
+        "updated_at": "2018-03-19T19:17:22Z",
         "project_id": "0bd18306d801447bb457a46252d82d13",
         "tenant_id": "0bd18306d801447bb457a46252d82d13",
         "service_type_id": null
diff --git a/api-ref/source/v2/samples/routers/routers-list-response.json b/api-ref/source/v2/samples/routers/routers-list-response.json
index 499f71431..954b3665c 100644
--- a/api-ref/source/v2/samples/routers/routers-list-response.json
+++ b/api-ref/source/v2/samples/routers/routers-list-response.json
@@ -6,6 +6,7 @@
             "availability_zones": [
                 "nova"
             ],
+            "created_at": "2018-03-19T19:17:04Z",
             "description": "",
             "distributed": false,
             "external_gateway_info": {
@@ -34,6 +35,7 @@
                 }
             ],
             "status": "ACTIVE",
+            "updated_at": "2018-03-19T19:17:22Z",
             "project_id": "0bd18306d801447bb457a46252d82d13",
             "tenant_id": "0bd18306d801447bb457a46252d82d13",
             "service_type_id": null
@@ -44,6 +46,7 @@
             "availability_zones": [
                 "nova"
             ],
+            "created_at": "2018-03-19T19:17:04Z",
             "description": "",
             "distributed": false,
             "external_gateway_info": {
@@ -67,6 +70,7 @@
             "revision_number": 1,
             "routes": [],
             "status": "ACTIVE",
+            "updated_at": "2018-03-19T19:17:22Z",
             "project_id": "0bd18306d801447bb457a46252d82d13",
             "tenant_id": "0bd18306d801447bb457a46252d82d13",
             "service_type_id": null
diff --git a/api-ref/source/v2/samples/security-groups/security-group-create-response.json b/api-ref/source/v2/samples/security-groups/security-group-create-response.json
index 70ed9a7ee..0a13f088d 100644
--- a/api-ref/source/v2/samples/security-groups/security-group-create-response.json
+++ b/api-ref/source/v2/samples/security-groups/security-group-create-response.json
@@ -15,6 +15,8 @@
                 "remote_ip_prefix": null,
                 "security_group_id": "2076db17-a522-4506-91de-c6dd8e837028",
                 "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                "created_at": "2018-03-19T19:16:56Z",
+                "updated_at": "2018-03-19T19:16:56Z",
                 "revision_number": 1,
                 "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                 "description": ""
@@ -30,12 +32,16 @@
                 "remote_ip_prefix": null,
                 "security_group_id": "2076db17-a522-4506-91de-c6dd8e837028",
                 "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                "created_at": "2018-03-19T19:16:56Z",
+                "updated_at": "2018-03-19T19:16:56Z",
                 "revision_number": 1,
                 "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                 "description": ""
             }
         ],
         "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+        "created_at": "2018-03-19T19:16:56Z",
+        "updated_at": "2018-03-19T19:16:56Z",
         "revision_number": 1,
         "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550"
     }
diff --git a/api-ref/source/v2/samples/security-groups/security-group-rule-create-response.json b/api-ref/source/v2/samples/security-groups/security-group-rule-create-response.json
index 43bc16149..1432f5337 100644
--- a/api-ref/source/v2/samples/security-groups/security-group-rule-create-response.json
+++ b/api-ref/source/v2/samples/security-groups/security-group-rule-create-response.json
@@ -12,6 +12,8 @@
         "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
         "revision_number": 1,
         "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+        "created_at": "2018-03-19T19:16:56Z",
+        "updated_at": "2018-03-19T19:16:56Z",
         "description": ""
     }
 }
diff --git a/api-ref/source/v2/samples/security-groups/security-group-rule-show-response.json b/api-ref/source/v2/samples/security-groups/security-group-rule-show-response.json
index 84c3306bf..da5e3a9ad 100644
--- a/api-ref/source/v2/samples/security-groups/security-group-rule-show-response.json
+++ b/api-ref/source/v2/samples/security-groups/security-group-rule-show-response.json
@@ -9,6 +9,8 @@
         "remote_group_id": null,
         "remote_ip_prefix": null,
         "revision_number": 1,
+        "created_at": "2018-03-19T19:16:56Z",
+        "updated_at": "2018-03-19T19:16:56Z",
         "security_group_id": "85cc3048-abc3-43cc-89b3-377341426ac5",
         "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
         "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550"
diff --git a/api-ref/source/v2/samples/security-groups/security-group-rules-list-response.json b/api-ref/source/v2/samples/security-groups/security-group-rules-list-response.json
index 6ef2cc327..4e9cc88ac 100644
--- a/api-ref/source/v2/samples/security-groups/security-group-rules-list-response.json
+++ b/api-ref/source/v2/samples/security-groups/security-group-rules-list-response.json
@@ -12,6 +12,8 @@
             "security_group_id": "85cc3048-abc3-43cc-89b3-377341426ac5",
             "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "revision_number": 1,
+            "created_at": "2018-03-19T19:16:56Z",
+            "updated_at": "2018-03-19T19:16:56Z",
             "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "description": ""
         },
@@ -27,6 +29,8 @@
             "security_group_id": "85cc3048-abc3-43cc-89b3-377341426ac5",
             "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "revision_number": 1,
+            "created_at": "2018-03-19T19:16:56Z",
+            "updated_at": "2018-03-19T19:16:56Z",
             "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "description": ""
         },
@@ -42,6 +46,8 @@
             "security_group_id": "85cc3048-abc3-43cc-89b3-377341426ac5",
             "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "revision_number": 2,
+            "created_at": "2018-03-19T19:16:56Z",
+            "updated_at": "2018-03-19T19:16:56Z",
             "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "description": ""
         },
@@ -57,6 +63,8 @@
             "security_group_id": "85cc3048-abc3-43cc-89b3-377341426ac5",
             "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "revision_number": 1,
+            "created_at": "2018-03-19T19:16:56Z",
+            "updated_at": "2018-03-19T19:16:56Z",
             "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "description": ""
         }
diff --git a/api-ref/source/v2/samples/security-groups/security-group-show-response.json b/api-ref/source/v2/samples/security-groups/security-group-show-response.json
index bca2d4eae..aedb046f1 100644
--- a/api-ref/source/v2/samples/security-groups/security-group-show-response.json
+++ b/api-ref/source/v2/samples/security-groups/security-group-show-response.json
@@ -17,6 +17,8 @@
                 "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                 "revision_number": 1,
                 "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                "created_at": "2018-03-19T19:16:56Z",
+                "updated_at": "2018-03-19T19:16:56Z",
                 "description": ""
             },
             {
@@ -32,6 +34,8 @@
                 "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                 "revision_number": 2,
                 "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                "created_at": "2018-03-19T19:16:56Z",
+                "updated_at": "2018-03-19T19:16:56Z",
                 "description": ""
             },
             {
@@ -47,6 +51,8 @@
                 "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                 "revision_number": 1,
                 "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                "created_at": "2018-03-19T19:16:56Z",
+                "updated_at": "2018-03-19T19:16:56Z",
                 "description": ""
             },
             {
@@ -62,10 +68,14 @@
                 "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                 "revision_number": 1,
                 "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                "created_at": "2018-03-19T19:16:56Z",
+                "updated_at": "2018-03-19T19:16:56Z",
                 "description": ""
             }
         ],
         "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+        "created_at": "2018-03-19T19:16:56Z",
+        "updated_at": "2018-03-19T19:16:56Z",
         "revision_number": 4,
         "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550"
     }
diff --git a/api-ref/source/v2/samples/security-groups/security-group-update-response.json b/api-ref/source/v2/samples/security-groups/security-group-update-response.json
index 8750ff39a..919c0d353 100644
--- a/api-ref/source/v2/samples/security-groups/security-group-update-response.json
+++ b/api-ref/source/v2/samples/security-groups/security-group-update-response.json
@@ -4,6 +4,8 @@
         "project_id": "a52cdb9cc7854a39a23d3af73a40899e",
         "revision_number": 4,
         "tenant_id": "a52cdb9cc7854a39a23d3af73a40899e",
+        "created_at": "2018-03-19T19:16:56Z",
+        "updated_at": "2018-03-19T19:16:56Z",
         "id": "01fbade5-b664-42f6-83ae-4e214f4263fa",
         "name": "mysecgroup",
         "description": "my security group"
diff --git a/api-ref/source/v2/samples/security-groups/security-groups-list-response.json b/api-ref/source/v2/samples/security-groups/security-groups-list-response.json
index b886f9187..866b03c14 100644
--- a/api-ref/source/v2/samples/security-groups/security-groups-list-response.json
+++ b/api-ref/source/v2/samples/security-groups/security-groups-list-response.json
@@ -18,6 +18,8 @@
                     "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                     "revision_number": 1,
                     "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                    "created_at": "2018-03-19T19:16:56Z",
+                    "updated_at": "2018-03-19T19:16:56Z",
                     "description": ""
                 },
                 {
@@ -33,6 +35,8 @@
                     "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                     "revision_number": 2,
                     "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                    "created_at": "2018-03-19T19:16:56Z",
+                    "updated_at": "2018-03-19T19:16:56Z",
                     "description": ""
                 },
                 {
@@ -48,6 +52,8 @@
                     "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                     "revision_number": 1,
                     "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                    "created_at": "2018-03-19T19:16:56Z",
+                    "updated_at": "2018-03-19T19:16:56Z",
                     "description": ""
                 },
                 {
@@ -63,11 +69,15 @@
                     "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
                     "revision_number": 1,
                     "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550",
+                    "created_at": "2018-03-19T19:16:56Z",
+                    "updated_at": "2018-03-19T19:16:56Z",
                     "description": ""
                 }
             ],
             "project_id": "e4f50856753b4dc6afee5fa6b9b6c550",
             "revision_number": 8,
+            "created_at": "2018-03-19T19:16:56Z",
+            "updated_at": "2018-03-19T19:16:56Z",
             "tenant_id": "e4f50856753b4dc6afee5fa6b9b6c550"
         }
     ]
diff --git a/api-ref/source/v2/samples/segments/segment-create-response.json b/api-ref/source/v2/samples/segments/segment-create-response.json
index 3692bea54..822dcc142 100644
--- a/api-ref/source/v2/samples/segments/segment-create-response.json
+++ b/api-ref/source/v2/samples/segments/segment-create-response.json
@@ -7,6 +7,8 @@
     "physical_network": "segment-1",
     "revision_number": 1,
     "id": "57fe85e4-ca2f-4192-b3cd-d5c249d7a21f",
+    "created_at": "2018-03-19T19:16:56Z",
+    "updated_at": "2018-03-19T19:16:56Z",
     "description": null
   }
 }
diff --git a/api-ref/source/v2/samples/segments/segment-show-response.json b/api-ref/source/v2/samples/segments/segment-show-response.json
index 3692bea54..822dcc142 100644
--- a/api-ref/source/v2/samples/segments/segment-show-response.json
+++ b/api-ref/source/v2/samples/segments/segment-show-response.json
@@ -7,6 +7,8 @@
     "physical_network": "segment-1",
     "revision_number": 1,
     "id": "57fe85e4-ca2f-4192-b3cd-d5c249d7a21f",
+    "created_at": "2018-03-19T19:16:56Z",
+    "updated_at": "2018-03-19T19:16:56Z",
     "description": null
   }
 }
diff --git a/api-ref/source/v2/samples/segments/segment-update-response.json b/api-ref/source/v2/samples/segments/segment-update-response.json
index fd8793479..3ce53757a 100644
--- a/api-ref/source/v2/samples/segments/segment-update-response.json
+++ b/api-ref/source/v2/samples/segments/segment-update-response.json
@@ -7,6 +7,8 @@
     "physical_network": "segment-1",
     "revision_number": 4,
     "id": "57fe85e4-ca2f-4192-b3cd-d5c249d7a21f",
+    "created_at": "2018-03-19T19:16:56Z",
+    "updated_at": "2018-03-19T19:16:56Z",
     "description": "Segment One"
   }
 }
diff --git a/api-ref/source/v2/samples/segments/segments-list-response.json b/api-ref/source/v2/samples/segments/segments-list-response.json
index 432248558..d153950b2 100644
--- a/api-ref/source/v2/samples/segments/segments-list-response.json
+++ b/api-ref/source/v2/samples/segments/segments-list-response.json
@@ -8,6 +8,8 @@
       "physical_network": "segment-1",
       "revision_number": 1,
       "id": "57fe85e4-ca2f-4192-b3cd-d5c249d7a21f",
+      "created_at": "2018-03-19T19:16:56Z",
+      "updated_at": "2018-03-19T19:16:56Z",
       "description": null
     },
     {
@@ -18,6 +20,8 @@
       "physical_network": "segment-2",
       "revision_number": 3,
       "id": "f1364c3a-4fc1-4206-b2dc-3254bc25cbfc",
+      "created_at": "2018-03-19T19:16:56Z",
+      "updated_at": "2018-03-19T19:16:56Z",
       "description": null
     }
   ]
diff --git a/api-ref/source/v2/samples/subnets/subnet-update-response.json b/api-ref/source/v2/samples/subnets/subnet-update-response.json
index 7af177d5c..69f826254 100644
--- a/api-ref/source/v2/samples/subnets/subnet-update-response.json
+++ b/api-ref/source/v2/samples/subnets/subnet-update-response.json
@@ -7,6 +7,7 @@
         "segment_id": null,
         "project_id": "26a7980765d0414dbc1fc1f88cdb7e6e",
         "tenant_id": "26a7980765d0414dbc1fc1f88cdb7e6e",
+        "created_at": "2016-03-08T20:19:41",
         "dns_nameservers": [],
         "service_types": [],
         "allocation_pools": [
@@ -19,6 +20,7 @@
         "ip_version": 4,
         "gateway_ip": "10.0.0.1",
         "cidr": "10.0.0.0/24",
+        "updated_at": "2016-03-08T20:19:41",
         "id": "08eae331-0402-425a-923c-34f7cfe39c1b",
         "description": ""
     }
diff --git a/api-ref/source/v2/samples/subnets/subnetpool-create-response.json b/api-ref/source/v2/samples/subnets/subnetpool-create-response.json
index cfacc75e3..8c50c2b42 100644
--- a/api-ref/source/v2/samples/subnets/subnetpool-create-response.json
+++ b/api-ref/source/v2/samples/subnets/subnetpool-create-response.json
@@ -17,6 +17,8 @@
         "project_id": "9fadcee8aa7c40cdb2114fff7d569c08",
         "revision_number": 1,
         "shared": false,
+        "created_at": "2016-03-08T20:19:41",
+        "updated_at": "2016-03-08T20:19:41",
         "tenant_id": "9fadcee8aa7c40cdb2114fff7d569c08"
     }
 }
diff --git a/api-ref/source/v2/samples/subnets/subnetpool-update-response.json b/api-ref/source/v2/samples/subnets/subnetpool-update-response.json
index 1239174f4..8db1f7078 100644
--- a/api-ref/source/v2/samples/subnets/subnetpool-update-response.json
+++ b/api-ref/source/v2/samples/subnets/subnetpool-update-response.json
@@ -17,6 +17,8 @@
         "id": "03f761e6-eee0-43fc-a921-8acf64c14988",
         "max_prefixlen": 64,
         "description": "",
+        "created_at": "2016-03-08T20:19:41",
+        "updated_at": "2016-03-08T20:19:41",
         "revision_number": 2
     }
 }
diff --git a/api-ref/source/v2/samples/subnets/subnetpools-list-response.json b/api-ref/source/v2/samples/subnets/subnetpools-list-response.json
index 5ffc57ef3..b4b659b38 100644
--- a/api-ref/source/v2/samples/subnets/subnetpools-list-response.json
+++ b/api-ref/source/v2/samples/subnets/subnetpools-list-response.json
@@ -18,6 +18,8 @@
             "ip_version": 6,
             "shared": false,
             "description": "",
+            "created_at": "2016-03-08T20:19:41",
+            "updated_at": "2016-03-08T20:19:41",
             "revision_number": 2
         },
         {
@@ -38,6 +40,8 @@
             "ip_version": 4,
             "shared": false,
             "description": "",
+            "created_at": "2016-03-08T20:19:41",
+            "updated_at": "2016-03-08T20:19:41",
             "revision_number": 2
         }
     ]
diff --git a/api-ref/source/v2/security-group-rules.inc b/api-ref/source/v2/security-group-rules.inc
index 891744549..e37109991 100644
--- a/api-ref/source/v2/security-group-rules.inc
+++ b/api-ref/source/v2/security-group-rules.inc
@@ -9,6 +9,12 @@ Security group rules (security-group-rules)
 Lists, creates, shows information for, and deletes security group
 rules.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 List security group rules
 =========================
 
@@ -65,6 +71,8 @@ Response Parameters
    - project_id: project_id
    - port_range_min: port_range_min
    - remote_ip_prefix: remote_ip_prefix
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - revision_number: revision_number
    - id: security_group_rule-id
    - description: description
@@ -124,6 +132,8 @@ Response Parameters
    - project_id: project_id
    - port_range_min: port_range_min
    - remote_ip_prefix: remote_ip_prefix
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - revision_number: revision_number
    - id: security_group_rule-id
    - description: description
@@ -173,6 +183,8 @@ Response Parameters
    - project_id: project_id
    - port_range_min: port_range_min
    - remote_ip_prefix: remote_ip_prefix
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - revision_number: revision_number
    - id: security_group_rule-id
    - description: description
diff --git a/api-ref/source/v2/security-groups.inc b/api-ref/source/v2/security-groups.inc
index 8fb8b0aca..c6f08d82c 100644
--- a/api-ref/source/v2/security-groups.inc
+++ b/api-ref/source/v2/security-groups.inc
@@ -7,6 +7,12 @@ Security groups (security-groups)
 Lists, creates, shows information for, updates, and deletes
 security groups.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 List security groups
 ====================
 
@@ -55,6 +61,8 @@ Response Parameters
    - id: security_group-id
    - tenant_id: project_id
    - project_id: project_id
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - revision_number: revision_number
    - name: name
    - description: description
@@ -106,6 +114,8 @@ Response Parameters
    - id: security_group-id
    - tenant_id: project_id
    - project_id: project_id
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - revision_number: revision_number
    - name: name
    - description: description
@@ -154,6 +164,8 @@ Response Parameters
    - id: security_group-id
    - tenant_id: project_id
    - project_id: project_id
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - revision_number: revision_number
    - name: name
    - description: description
@@ -201,6 +213,8 @@ Response Parameters
    - id: security_group-id
    - tenant_id: project_id
    - project_id: project_id
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - revision_number: revision_number
    - name: name
    - description: description
diff --git a/api-ref/source/v2/segments.inc b/api-ref/source/v2/segments.inc
index 0e928f694..f7e8c8b06 100644
--- a/api-ref/source/v2/segments.inc
+++ b/api-ref/source/v2/segments.inc
@@ -7,6 +7,12 @@ Segments
 Lists, shows details for, creates, updates, and deletes segments. The
 segments API is admin-only.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 Show segment details
 ====================
 
@@ -44,6 +50,8 @@ Response Parameters
    - segmentation_id: provider:segmentation_id
    - name: name
    - description: description
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -90,6 +98,8 @@ Response Parameters
    - segmentation_id: provider:segmentation_id
    - name: name
    - description: description
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -166,6 +176,8 @@ Response Parameters
    - segmentation_id: provider:segmentation_id
    - name: name
    - description: description
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -215,6 +227,8 @@ Response Parameters
    - segmentation_id: provider:segmentation_id
    - name: name
    - description: description
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
diff --git a/api-ref/source/v2/subnetpools.inc b/api-ref/source/v2/subnetpools.inc
index 93cc05f7a..f4c2de208 100644
--- a/api-ref/source/v2/subnetpools.inc
+++ b/api-ref/source/v2/subnetpools.inc
@@ -14,6 +14,12 @@ The ``address-scope`` extension adds the ``address_scope_id`` attribute to
 subnet pools. ``address_scope_id`` is the ID of the address scope that the
 subnet pool belongs to.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 Show subnet pool
 ================
 
@@ -49,8 +55,8 @@ Response Parameters
    - default_quota: default_quota
    - tenant_id: project_id
    - project_id: project_id
-   - created_at: created_at
-   - updated_at: updated_at
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - prefixes: prefixes
    - min_prefixlen: min_prefixlen
    - address_scope_id: address_scope_id
@@ -114,8 +120,8 @@ Response Parameters
    - default_quota: default_quota
    - tenant_id: project_id
    - project_id: project_id
-   - created_at: created_at
-   - updated_at: updated_at
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - prefixes: prefixes
    - min_prefixlen: min_prefixlen
    - address_scope_id: address_scope_id
@@ -217,8 +223,8 @@ Response Parameters
    - default_quota: default_quota
    - tenant_id: project_id
    - project_id: project_id
-   - created_at: created_at
-   - updated_at: updated_at
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - prefixes: prefixes
    - min_prefixlen: min_prefixlen
    - address_scope_id: address_scope_id
@@ -282,8 +288,8 @@ Response Parameters
    - default_quota: default_quota
    - tenant_id: project_id
    - project_id: project_id
-   - created_at: created_at
-   - updated_at: updated_at
+   - created_at: created_at_resource
+   - updated_at: updated_at_resource
    - prefixes: prefixes
    - min_prefixlen: min_prefixlen
    - address_scope_id: address_scope_id
@@ -299,4 +305,4 @@ Response Example
 ----------------
 
 .. literalinclude:: samples/subnets/subnetpool-create-response.json
-   :language: javascript
\ No newline at end of file
+   :language: javascript
diff --git a/api-ref/source/v2/subnets.inc b/api-ref/source/v2/subnets.inc
index 15b95193f..3f5451f5c 100644
--- a/api-ref/source/v2/subnets.inc
+++ b/api-ref/source/v2/subnets.inc
@@ -16,13 +16,18 @@ IP version). Then users can specify the ``use_default_subnetpool``
 attribute when creating a subnet, instead of having to specify the
 ``subnetpool_id`` attribute referencing the default subnetpool.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 Subnet allocation extension
 ===========================
 
 Subnet allocation extension (``subnet_allocation``) enables allocation of
 subnets from a subnet pool.
 
-
 Subnet service types extension
 ==============================
 
@@ -102,7 +107,7 @@ Response Parameters
    - ip_version: subnet-ip_version
    - gateway_ip: subnet-gateway_ip
    - cidr: cidr
-   - created_at: subnet-created_at
+   - created_at: created_at_resource
    - description: description
    - ipv6_address_mode: subnet-ipv6_address_mode
    - ipv6_ra_mode: subnet-ipv6_ra_mode
@@ -110,7 +115,7 @@ Response Parameters
    - segment_id: subnet-segment_id
    - service_types: subnet-service_types
    - subnetpool_id: subnet-subnetpool_id
-   - updated_at: subnet-updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -215,7 +220,7 @@ Response Parameters
    - ip_version: subnet-ip_version
    - gateway_ip: subnet-gateway_ip
    - cidr: cidr
-   - created_at: subnet-created_at
+   - created_at: created_at_resource
    - description: description
    - ipv6_address_mode: subnet-ipv6_address_mode
    - ipv6_ra_mode: subnet-ipv6_ra_mode
@@ -223,7 +228,7 @@ Response Parameters
    - service_types: subnet-service_types
    - subnetpool_id: subnet-subnetpool_id
    - segment_id: subnet-segment_id
-   - updated_at: subnet-updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -295,7 +300,7 @@ Response Parameters
    - ip_version: subnet-ip_version
    - gateway_ip: subnet-gateway_ip
    - cidr: cidr
-   - created_at: subnet-created_at
+   - created_at: created_at_resource
    - description: description
    - ipv6_address_mode: subnet-ipv6_address_mode
    - ipv6_ra_mode: subnet-ipv6_ra_mode
@@ -303,7 +308,7 @@ Response Parameters
    - segment_id: subnet-segment_id
    - service_types: subnet-service_types
    - subnetpool_id: subnet-subnetpool_id
-   - updated_at: subnet-updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
@@ -340,7 +345,7 @@ Response Parameters
    - id: subnet-id-body
    - tenant_id: project_id
    - project_id: project_id
-   - created_at: subnet-created_at
+   - created_at: created_at_resource
    - name: subnet-name
    - enable_dhcp: subnet-enable_dhcp
    - network_id: subnet-network_id
@@ -350,7 +355,7 @@ Response Parameters
    - ip_version: subnet-ip_version
    - gateway_ip: subnet-gateway_ip
    - cidr: cidr
-   - updated_at: subnet-updated_at
+   - updated_at: updated_at_resource
    - description: description
    - ipv6_address_mode: subnet-ipv6_address_mode
    - ipv6_ra_mode: subnet-ipv6_ra_mode
@@ -419,7 +424,7 @@ Response Parameters
    - ip_version: subnet-ip_version
    - gateway_ip: subnet-gateway_ip
    - cidr: cidr
-   - created_at: subnet-created_at
+   - created_at: created_at_resource
    - description: description
    - ipv6_address_mode: subnet-ipv6_address_mode
    - ipv6_ra_mode: subnet-ipv6_ra_mode
@@ -427,7 +432,7 @@ Response Parameters
    - segment_id: subnet-segment_id
    - service_types: subnet-service_types
    - subnetpool_id: subnet-subnetpool_id
-   - updated_at: subnet-updated_at
+   - updated_at: updated_at_resource
 
 Response Example
 ----------------
diff --git a/api-ref/source/v2/trunk.inc b/api-ref/source/v2/trunk.inc
index b388e08d8..68c605462 100644
--- a/api-ref/source/v2/trunk.inc
+++ b/api-ref/source/v2/trunk.inc
@@ -21,6 +21,12 @@ In more details, the extension introduces the following resources:
 - **sub_port**. An association to a neutron logical port with attributes
   segmentation_id and segmentation_type.
 
+Resource timestamps
+===================
+
+The ``standard-attr-timestamp`` extension adds the ``created_at`` and
+``updated_at`` attributes to all resources that have standard attributes.
+
 
 List trunks
 ===========