diff --git a/wp-includes/class-wp-xmlrpc-server.php b/wp-includes/class-wp-xmlrpc-server.php
index d21531831f..8cc33b116d 100644
--- a/wp-includes/class-wp-xmlrpc-server.php
+++ b/wp-includes/class-wp-xmlrpc-server.php
@@ -1469,8 +1469,8 @@ class wp_xmlrpc_server extends IXR_Server {
 		$post_data['edit_date'] = false;
 
 		if ( ! empty( $dateCreated ) ) {
-			$post_data['post_date']     = get_date_from_gmt( iso8601_to_datetime( $dateCreated ) );
-			$post_data['post_date_gmt'] = iso8601_to_datetime( $dateCreated, 'GMT' );
+			$post_data['post_date']     = iso8601_to_datetime( $dateCreated );
+			$post_data['post_date_gmt'] = iso8601_to_datetime( $dateCreated, 'gmt' );
 
 			// Flag the post date to be edited.
 			$post_data['edit_date'] = true;
@@ -3766,8 +3766,8 @@ class wp_xmlrpc_server extends IXR_Server {
 		if ( ! empty( $content_struct['date_created_gmt'] ) ) {
 			// We know this is supposed to be GMT, so we're going to slap that Z on there by force
 			$dateCreated                 = rtrim( $content_struct['date_created_gmt']->getIso(), 'Z' ) . 'Z';
-			$comment['comment_date']     = get_date_from_gmt( iso8601_to_datetime( $dateCreated ) );
-			$comment['comment_date_gmt'] = iso8601_to_datetime( $dateCreated, 'GMT' );
+			$comment['comment_date']     = get_date_from_gmt( $dateCreated );
+			$comment['comment_date_gmt'] = iso8601_to_datetime( $dateCreated, 'gmt' );
 		}
 
 		if ( isset( $content_struct['content'] ) ) {
@@ -5485,8 +5485,8 @@ class wp_xmlrpc_server extends IXR_Server {
 		}
 
 		if ( ! empty( $dateCreated ) ) {
-			$post_date     = get_date_from_gmt( iso8601_to_datetime( $dateCreated ) );
-			$post_date_gmt = iso8601_to_datetime( $dateCreated, 'GMT' );
+			$post_date     = iso8601_to_datetime( $dateCreated );
+			$post_date_gmt = iso8601_to_datetime( $dateCreated, 'gmt' );
 		} else {
 			$post_date     = '';
 			$post_date_gmt = '';
@@ -5874,8 +5874,8 @@ class wp_xmlrpc_server extends IXR_Server {
 		$edit_date = false;
 
 		if ( ! empty( $dateCreated ) ) {
-			$post_date     = get_date_from_gmt( iso8601_to_datetime( $dateCreated ) );
-			$post_date_gmt = iso8601_to_datetime( $dateCreated, 'GMT' );
+			$post_date     = iso8601_to_datetime( $dateCreated );
+			$post_date_gmt = iso8601_to_datetime( $dateCreated, 'gmt' );
 
 			// Flag the post date to be edited.
 			$edit_date = true;
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 754405b105..cacda43b97 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-46862';
+$wp_version = '5.4-alpha-46864';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.