PHP has a built-in `date()` function that formats Date-objects. In your case, you would use it as follows:

    echo date('Y', 1322697600);

Since you're using these query arguments to build up an array of posts, and you want to filter specifically on that, I'd recommend building a function that triggers the loop based on your desired year filter.

I have used a similar function like this one below before:

    function check_post_date($filter_year) {

        // Load the custom_date meta field
        $custom_date = get_post_meta( get_the_ID(), 'custom_date', true );

        // Turn it into a string that only displays the year
        $custom_date_year = date('Y', $custom_date);

        // If the years equal, return true.
        if( $custom_date_year == $filter_year ) {
             return true;           
        } else {
            return false;
        }
    }

With this, you can manipulate if the loop runs for this post.

For instance, if you want to filter on the year 2010, you can write your loop like this:

    <?php if (have_posts()) : while (have_posts()) : the_post(); ?>

        <?php if check_post_date('2010') : ?>
            
           <!-- Your loop goes here! -->
            
        <?php endif; ?>
        
    <?php endwhile; endif; ?>