Posts: Display Scheduled state for future-dated private posts

src/wp-admin/includes/template.php

@@ -2295,6 +2295,9 @@ function get_post_states( $post ) {
 	if ( 'private' === $post->post_status && 'private' !== $post_status ) {
 		$post_states['private'] = _x( 'Private', 'post status' );
 	}
+	if ( 'private' === $post->post_status && strtotime( $post->post_date_gmt ) > time() ) {
+		$post_states['scheduled'] = _x( 'Scheduled', 'post status' );
+	}
 
 	if ( 'draft' === $post->post_status ) {
 		if ( get_post_meta( $post->ID, '_customize_changeset_uuid', true ) ) {

tests/phpunit/tests/post.php

@@ -759,4 +759,52 @@ public function test_use_block_editor_for_post() {
 		$this->assertTrue( use_block_editor_for_post( $restless_post_id ) );
 		remove_filter( 'use_block_editor_for_post', '__return_true' );
 	}
+
+	/**
+	 * Tests that a private post with a future date returns both 'Private' and 'Scheduled' states.
+	 *
+	 * @ticket 18264
+	 */
+	public function test_get_post_states_for_future_dated_private_post() {
+		$future_date = gmdate( 'Y-m-d H:i:s', time() + HOUR_IN_SECONDS );
+
+		$post = self::factory()->post->create_and_get(
+			array(
+				'post_status'   => 'private',
+				'post_date'     => get_date_from_gmt( $future_date ),
+				'post_date_gmt' => $future_date,
+			)
+		);
+
+		$this->assertSame(
+			array(
+				'private'   => 'Private',
+				'scheduled' => 'Scheduled',
+			),
+			get_post_states( $post )
+		);
+	}
+
+	/**
+	 * Tests that the _post_states() function correctly renders the HTML
+	 * for a future-dated private post.
+	 *
+	 * @ticket 18264
+	 */
+	public function test_post_states_renders_correctly_for_future_private_post() {
+		$future_date = gmdate( 'Y-m-d H:i:s', time() + HOUR_IN_SECONDS );
+
+		$post = self::factory()->post->create_and_get(
+			array(
+				'post_status'   => 'private',
+				'post_date'     => get_date_from_gmt( $future_date ),
+				'post_date_gmt' => $future_date,
+			)
+		);
+
+		$rendered_states = _post_states( $post, false );
+
+		$this->assertStringContainsString( 'Private', $rendered_states );
+		$this->assertStringContainsString( 'Scheduled', $rendered_states );
+	}
 }