Ticket #44975: 44975.diff

src/wp-includes/rest-api.php

@@ -1206 +1206 @@
         if ( isset( $args['format'] ) ) {
                 switch ( $args['format'] ) {
                         case 'date-time':
-                                if ( ! rest_parse_date( $value ) ) {
+                                if ( '' !== $value && ! rest_parse_date( $value ) ) {
                                         return new WP_Error( 'rest_invalid_date', __( 'Invalid date.' ) );
                                 }
                                 break;

src/wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php

@@ -1036 +1036 @@
                         }
                 }
 
+                // Sending a blank date or date_gmt value resets date and date_gmt to their default values (`0000-00-00 00:00:00`).
+                if (
+                        ( isset( $request[ 'date_gmt' ] ) && '' === $request[ 'date_gmt' ] ) ||
+                        ( isset( $request[ 'date' ] ) && '' === $request[ 'date' ] )
+                ) {
+                        $prepared_post->post_date_gmt = null;
+                        $prepared_post->post_date = null;
+                }
+
                 // Post slug.
                 if ( ! empty( $schema['properties']['slug'] ) && isset( $request['slug'] ) ) {
                         $prepared_post->post_name = $request['slug'];