diff --git a/composer.json b/composer.json
index ab971df..9f2b772 100644
--- a/composer.json
+++ b/composer.json
@@ -61,7 +61,7 @@
                 "Fix PHP 8.2 deprecation notices": "https://www.drupal.org/files/issues/2023-05-22/3343964-5.patch"
             },
             "drupal/core": {
-                "Users can't reference unpublished content even when they have access to it. See https://www.drupal.org/project/drupal/issues/2845144": "https://www.drupal.org/files/issues/2024-01-07/2845144-78.patch"
+                "Users can't reference unpublished content even when they have access to it. See https://www.drupal.org/project/drupal/issues/2845144": "https://www.drupal.org/files/issues/2024-02-13/2845144-87.patch"
             }
         }
     }
diff --git a/config/install/core.date_format.long.yml b/config/install/core.date_format.long.yml
index 42c6d12..6d07530 100644
--- a/config/install/core.date_format.long.yml
+++ b/config/install/core.date_format.long.yml
@@ -4,4 +4,4 @@ dependencies: {  }
 id: long
 label: 'Default long date'
 locked: false
-pattern: 'l j F Y - g:ia'
+pattern: 'l j F Y \a\t g:ia'
diff --git a/config/install/core.date_format.medium.yml b/config/install/core.date_format.medium.yml
index 9012ea8..333fa78 100644
--- a/config/install/core.date_format.medium.yml
+++ b/config/install/core.date_format.medium.yml
@@ -4,4 +4,4 @@ dependencies: {  }
 id: medium
 label: 'Default medium date'
 locked: false
-pattern: 'D, d/m/Y - g:ia'
+pattern: 'D d/m/Y g:ia'
diff --git a/config/install/core.date_format.short.yml b/config/install/core.date_format.short.yml
index 6ef9b80..a31214c 100644
--- a/config/install/core.date_format.short.yml
+++ b/config/install/core.date_format.short.yml
@@ -4,4 +4,4 @@ dependencies: {  }
 id: short
 label: 'Default short date'
 locked: false
-pattern: 'd/m/Y - g:ia'
+pattern: 'd/m/Y g:ia'
diff --git a/localgov.install b/localgov.install
index b78b971..7b2eb11 100644
--- a/localgov.install
+++ b/localgov.install
@@ -55,3 +55,25 @@ function localgov_update_9501() {
     \Drupal::service('theme_installer')->install(['stable9']);
   }
 }
+
+/**
+ * Update default date formats to GDS if they haven't been changed.
+ */
+function localgov_update_9502() {
+  $config_factory = \Drupal::configFactory();
+  $config = $config_factory->getEditable('core.date_format.long');
+  if ($config->get('pattern') == 'l j F Y - g:ia') {
+    $config->set('pattern', 'l j F Y \a\t g:ia');
+    $config->save(TRUE);
+  }
+  $config = $config_factory->getEditable('core.date_format.medium');
+  if ($config->get('pattern') == 'D, d/m/Y - g:ia') {
+    $config->set('pattern', 'D d/m/Y g:ia');
+    $config->save(TRUE);
+  }
+  $config = $config_factory->getEditable('core.date_format.short');
+  if ($config->get('pattern') == 'd/m/Y - g:ia') {
+    $config->set('pattern', 'd/m/Y g:ia');
+    $config->save(TRUE);
+  }
+}