WordPress Dynamic Year shortcode. Just add to your functions.php file and use the [year] shortcode in post titles and content.

wp-dynamic-year.php

//* Enable Post Meta Shortcode Support
add_filter( 'single_post_title', 'do_shortcode' );

//* Enable Post Title Shortcode
add_filter( 'the_title', 'do_shortcode' );

//* Current Year In Post Title Shortcode
add_shortcode( 'year' , 'current_year' );

    function current_year() {

    $year = date("Y");

    return "$year";

}