Automatically update year in email footer

I’m trying to include a copyright and a year at the bottom of my emails that I’m hoping will automatically update yearly. Is there any code I can use to make that happen?

I’ve tried the one I use on my website, but they do not work:
1. <?php echo date(“Y”); ?>

2. <?= date(“Y”) ?>

3.<span id=”year”></span></p> <script> document.getElementById(“year”).innerHTML = new Date().getFullYear(); </script>

4. {year} and ?{current_year} i