WordPress shortcode to get current year

Add in your functions.php

function current_year( $atts, $content = null ) {

	$current_year = date("Y");

	return $current_year;

	// [currentyear]
}

add_shortcode( 'currentyear', 'current_year' );

If you want to use plain PHP, you can use:

$current_year = date("Y");

echo $current_year;