I've been using joker for nearly twenty years and it has always just worked. I'm probably misunderstanding you, but when you renew a domain you get an extra ye

I've been using joker for nearly twenty years and it has always just worked. I'm probably misunderstanding you, but when you renew a domain you get an extra year (or whatever) measured from the expiry date, not measured from the renewal date. Renewing early doesn't lose you anything (except a bit of cash flow). This is true for .com and .uk anyway.