diff --git a/package-lock.json b/package-lock.json
index 9e1ce262346da8..104727385ff728 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18123,11 +18123,19 @@
 				"@wordpress/url": "file:packages/url",
 				"@wordpress/wordcount": "file:packages/wordcount",
 				"classnames": "^2.3.1",
+				"date-fns": "^2.28.0",
 				"lodash": "^4.17.21",
 				"memize": "^1.1.0",
 				"react-autosize-textarea": "^7.1.0",
 				"rememo": "^4.0.0",
 				"remove-accents": "^0.4.2"
+			},
+			"dependencies": {
+				"date-fns": {
+					"version": "2.29.3",
+					"resolved": "https://registry.npmjs.org/date-fns/-/date-fns-2.29.3.tgz",
+					"integrity": "sha512-dDCnyH2WnnKusqvZZ6+jA1O51Ibt8ZMRNkDZdyAyK4YfbDwa/cEmuztzG5pk6hqlp9aSBPYcjOlktquahGwGeA=="
+				}
 			}
 		},
 		"@wordpress/element": {
@@ -19134,12 +19142,6 @@
 				"@babel/runtime": "^7.16.0"
 			}
 		},
-		"@xmldom/xmldom": {
-			"version": "0.8.3",
-			"resolved": "https://registry.npmjs.org/@xmldom/xmldom/-/xmldom-0.8.3.tgz",
-			"integrity": "sha512-Lv2vySXypg4nfa51LY1nU8yDAGo/5YwF+EY/rUZgIbfvwVARcd67ttCM8SMsTeJy51YhHYavEq+FS6R0hW9PFQ==",
-			"dev": true
-		},
 		"@xtuc/ieee754": {
 			"version": "1.2.0",
 			"resolved": "https://registry.npmjs.org/@xtuc/ieee754/-/ieee754-1.2.0.tgz",
@@ -20250,6 +20252,12 @@
 						"@wdio/logger": "6.10.10"
 					}
 				},
+				"@xmldom/xmldom": {
+					"version": "0.7.5",
+					"resolved": "https://registry.npmjs.org/@xmldom/xmldom/-/xmldom-0.7.5.tgz",
+					"integrity": "sha512-V3BIhmY36fXZ1OtVcI9W+FxQqxVLsPKcNjWigIaa81dLC9IolJl5Mt4Cvhmr0flUnjSpTdrbMTSbXqYqV5dT6A==",
+					"dev": true
+				},
 				"accepts": {
 					"version": "1.3.7",
 					"resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
@@ -43785,7 +43793,7 @@
 		"lodash.isequal": {
 			"version": "4.5.0",
 			"resolved": "https://registry.npmjs.org/lodash.isequal/-/lodash.isequal-4.5.0.tgz",
-			"integrity": "sha1-QVxEePK8wwEgwizhDtMib30+GOA="
+			"integrity": "sha512-pDo3lu8Jhfjqls6GkMgpahsF9kCyayhgykjyLMNFTKWrpVdAQtYyB4muAMWozBB4ig/dtWAmsMxLEI8wuz+DYQ=="
 		},
 		"lodash.ismatch": {
 			"version": "4.4.0",
diff --git a/packages/editor/package.json b/packages/editor/package.json
index 9984a6ddbcef7d..d0d46269a53699 100644
--- a/packages/editor/package.json
+++ b/packages/editor/package.json
@@ -58,6 +58,7 @@
 		"@wordpress/url": "file:../url",
 		"@wordpress/wordcount": "file:../wordcount",
 		"classnames": "^2.3.1",
+		"date-fns": "^2.28.0",
 		"lodash": "^4.17.21",
 		"memize": "^1.1.0",
 		"react-autosize-textarea": "^7.1.0",
diff --git a/packages/editor/src/components/post-schedule/index.js b/packages/editor/src/components/post-schedule/index.js
index 7d410a30cca185..98a22a992113d5 100644
--- a/packages/editor/src/components/post-schedule/index.js
+++ b/packages/editor/src/components/post-schedule/index.js
@@ -1,3 +1,8 @@
+/**
+ * External dependencies
+ */
+import { parseISO, endOfMonth, startOfMonth } from 'date-fns';
+
 /**
  * WordPress dependencies
  */
@@ -12,15 +17,6 @@ import { store as coreStore } from '@wordpress/core-data';
  */
 import { store as editorStore } from '../../store';
 
-function getDayOfTheMonth( date = new Date(), firstDay = true ) {
-	const d = new Date( date );
-	return new Date(
-		d.getFullYear(),
-		d.getMonth() + ( firstDay ? 0 : 1 ),
-		firstDay ? 1 : 0
-	).toISOString();
-}
-
 export default function PostSchedule( { onClose } ) {
 	const { postDate, postType } = useSelect(
 		( select ) => ( {
@@ -34,7 +30,7 @@ export default function PostSchedule( { onClose } ) {
 	const onUpdateDate = ( date ) => editPost( { date } );
 
 	const [ previewedMonth, setPreviewedMonth ] = useState(
-		getDayOfTheMonth( postDate )
+		startOfMonth( new Date( postDate ) )
 	);
 
 	// Pick up published and schduled site posts.
@@ -42,22 +38,20 @@ export default function PostSchedule( { onClose } ) {
 		( select ) =>
 			select( coreStore ).getEntityRecords( 'postType', postType, {
 				status: 'publish,future',
-				after: getDayOfTheMonth( previewedMonth ),
-				before: getDayOfTheMonth( previewedMonth, false ),
+				after: startOfMonth( previewedMonth ).toISOString(),
+				before: endOfMonth( previewedMonth ).toISOString(),
 				exclude: [ select( editorStore ).getCurrentPostId() ],
+				per_page: 100,
+				_fields: 'id,date',
 			} ),
 		[ previewedMonth, postType ]
 	);
 
 	const events = useMemo(
 		() =>
-			( eventsByPostType || [] ).map(
-				( { title, type, date: eventDate } ) => ( {
-					title: title?.rendered,
-					type,
-					date: new Date( eventDate ),
-				} )
-			),
+			( eventsByPostType || [] ).map( ( { date: eventDate } ) => ( {
+				date: new Date( eventDate ),
+			} ) ),
 		[ eventsByPostType ]
 	);
 
@@ -80,7 +74,9 @@ export default function PostSchedule( { onClose } ) {
 			onChange={ onUpdateDate }
 			is12Hour={ is12HourTime }
 			events={ events }
-			onMonthPreviewed={ setPreviewedMonth }
+			onMonthPreviewed={ ( date ) =>
+				setPreviewedMonth( parseISO( date ) )
+			}
 			onClose={ onClose }
 		/>
 	);