check_and_publish_future_post( int|WP_Post $post_id )

Source

File: wp-includes/post.php

function check_and_publish_future_post( $post_id ) {
	$post = get_post( $post_id );

	if ( ! $post ) {
		return;
	}

	if ( 'future' !== $post->post_status ) {
		return;
	}

	$time = strtotime( $post->post_date_gmt . ' GMT' );

	// Uh oh, someone jumped the gun!
	if ( $time > time() ) {
		wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // Clear anything else in the system.
		wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
		return;
	}

	// wp_publish_post() returns no meaningful value.
	wp_publish_post( $post_id );
}