diff --git a/packages/block-library/src/comment-date/edit.js b/packages/block-library/src/comment-date/edit.js
index 52e73d8c988782..f0a09e3ea8c39d 100644
--- a/packages/block-library/src/comment-date/edit.js
+++ b/packages/block-library/src/comment-date/edit.js
@@ -2,7 +2,10 @@
  * WordPress dependencies
  */
 import { useEntityProp } from '@wordpress/core-data';
-import { dateI18n } from '@wordpress/date';
+import {
+	dateI18n,
+	__experimentalGetSettings as getDateSettings,
+} from '@wordpress/date';
 import {
 	InspectorControls,
 	useBlockProps,
@@ -31,7 +34,11 @@ export default function Edit( {
 } ) {
 	const blockProps = useBlockProps();
 	const [ date ] = useEntityProp( 'root', 'comment', 'date', commentId );
-	const [ siteFormat ] = useEntityProp( 'root', 'site', 'date_format' );
+	const [ siteFormat = getDateSettings().formats.date ] = useEntityProp(
+		'root',
+		'site',
+		'date_format'
+	);
 
 	const inspectorControls = (
 		<InspectorControls>
diff --git a/packages/block-library/src/post-date/edit.js b/packages/block-library/src/post-date/edit.js
index a44a8f556c4317..076e4d181867ff 100644
--- a/packages/block-library/src/post-date/edit.js
+++ b/packages/block-library/src/post-date/edit.js
@@ -8,7 +8,10 @@ import classnames from 'classnames';
  */
 import { useEntityProp } from '@wordpress/core-data';
 import { useRef } from '@wordpress/element';
-import { dateI18n } from '@wordpress/date';
+import {
+	dateI18n,
+	__experimentalGetSettings as getDateSettings,
+} from '@wordpress/date';
 import {
 	AlignmentControl,
 	BlockControls,
@@ -40,8 +43,17 @@ export default function PostDateEdit( {
 	} );
 	const timeRef = useRef();
 	const isDescendentOfQueryLoop = Number.isFinite( queryId );
-	const [ siteFormat ] = useEntityProp( 'root', 'site', 'date_format' );
-	const [ siteTimeFormat ] = useEntityProp( 'root', 'site', 'time_format' );
+	const dateSettings = getDateSettings();
+	const [ siteFormat = dateSettings.formats.date ] = useEntityProp(
+		'root',
+		'site',
+		'date_format'
+	);
+	const [ siteTimeFormat = dateSettings.formats.time ] = useEntityProp(
+		'root',
+		'site',
+		'time_format'
+	);
 	const [ date, setDate ] = useEntityProp(
 		'postType',
 		postType,