Custom date variable for Yoast SEO

gistfile1.txt

// define the custom replacement callback, returns the date in Jan 2019 format
function get_my_date() {
    return date('M Y');
}

// define the action for register yoast_variable replacments
function register_custom_yoast_variables() {
    wpseo_register_var_replacement( '%%my_date%%', 'get_my_date', 'advanced', 'returns the current date' );
}

// Add action
add_action('wpseo_register_extra_replacements', 'register_custom_yoast_variables');