oldest account creation date in the guild!

const { MessageEmbed } = require('discord.js')
const moment = require('moment')

exports.run = async (client, message, args) => {
    let mem = message.guild.members.cache
    .filter((m) => !m.user.bot)
    .sort((a, b) => a.user.createdAt - b.user.createdAt)
    .first();

    let createdate = moment.utc(mem.user.createdAt).format("dddd, MMMM Do YYYY, HH:mm:ss");

  const Embed = new MessageEmbed()
    .setAuthor(message.member.displayName,  message.author.displayAvatarURL({ dynamic: true }))
    .setFooter(client.user.username, client.user.displayAvatarURL())
    .setColor(message.member.displayHexColor)
    .setTimestamp()
    .setImage(mem.user.displayAvatarURL({size: 4096, dynamic: true}))
    .setTitle(`The oldest user in ${message.guild.name} is ${mem.user.tag}!`)
    .setDescription(`That user joined Discord in \`${createdate}\`!`);
  message.channel.send(Embed);
};


exports.help = {
  name: "oldest",
  description: "get the oldest account creation date in the guild!",
  usage: `oldest`,
  example: `oldest`
}

exports.conf = {
  aliases: [],
  cooldown: 2,
  guildOnly: true,

	c