xiao/commands/util/uptime.js

const { Command } = require('discord.js-commando');
const moment = require('moment');
require('moment-duration-format');

module.exports = class UptimeCommand extends Command {
    constructor(client) {
        super(client, {
            name: 'uptime',
            group: 'util',
            memberName: 'uptime',
            description: 'Displays how long the bot has been active on this shard.',
            guarded: true
        });
    }

    run(msg) {
        return msg.say(`I've been active on this shard for: **${moment.duration(this.client.uptime).format('d[ days], h[ hours], m[ minutes, and ]s[ seconds]')}**!`);
    }
};