title: change .joinedAt format in discord.js
body: <p>I'm making a user info command, and i want it to say when a user joined, it kinda works but i want to change the time format, this is the code that gets the join data:</p>
  <pre><code>message.member.joinedAt
  </code></pre>
  <p>i tried using .format('YYYY-MM-DD') right after joinedAt but nothing, this is what it looks like right now (it has italian text for some reason, probably because my discord account is registered in Italy)<a href="https://i.stack.imgur.com/SUVG1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SUVG1.png" alt="enter image description here" /></a></p>