Discord.js@14.0.3 Rainbow-Role Bot

index_1.js

const   { Client, GatewayIntentBits } = require('discord.js'), // discord.js@14.0.3
        client = new Client({ intents: [ GatewayIntentBits.Guilds ] });

client.login("your bot token")
    .then(() => {
        timeout1h();
    });

async function timeout1h() {
    setTimeout(timeout1h, 1000 * 60 * 60);
  
    client.guilds.fetch("any guild_id")
        .then(async (guild) => {
            const role = await guild.roles.fetch("any role_id");
            role.setColor("#FFFFFF")
        }).catch(console.log);
}

index_2.js

const   { Client, GatewayIntentBits } = require('discord.js'), // discord.js@14.0.3
        client = new Client({ intents: [ GatewayIntentBits.Guilds ] });

let colors = ["#E93237", "#FE7A18", "#FFF21F", "#48C90A", "#4AD9F8", "#4C63FF", "#771CBF"];

client.login("your bot token")
    .then(() => {
        const colors_count = 7;
        colors = new Array(colors_count);
        for (let i = 0; i < colors_count; i++ ) {
            const red   = sin_to_hex(i, 0 * Math.PI * 2/3); // 0   deg
            const blue  = sin_to_hex(i, 1 * Math.PI * 2/3); // 120 deg
            const green = sin_to_hex(i, 2 * Math.PI * 2/3); // 240 deg
            colors[i] = `#${red}${green}${blue}`; 
        }
        timeout1h();
    });

function sin_to_hex(i, phase) {
    const sin = Math.sin(Math.PI / colors.length * 2 * i + phase);
    const int = Math.floor(sin * 127) + 128;
    const hex = int.toString(16);
    return hex.length === 1 ? `0${hex}`: hex;
}

async function timeout1h() {
    setTimeout(timeout1h, 1000 * 60 * 60);
  
    client.guilds.fetch("any guild_id")
        .then(async (guild) => {
            const role = await guild.roles.fetch("any role_id");
            role.setColor("#FFFFFF")
        }).catch(console.log);
}

index_3.js

const   { Client, GatewayIntentBits } = require('discord.js'), // discord.js@14.0.3
        client = new Client({ intents: [ GatewayIntentBits.Guilds ] });

let colors = ["#E93237", "#FE7A18", "#FFF21F", "#48C90A", "#4AD9F8", "#4C63FF", "#771CBF"];
let color_index = -1;

client.login("your bot token")
    .then(() => {
        const colors_count = 7;
        colors = new Array(colors_count);
        for (let i = 0; i < colors_count; i++ ) {
            const red   = sin_to_hex(i, 0 * Math.PI * 2/3); // 0   deg
            const blue  = sin_to_hex(i, 1 * Math.PI * 2/3); // 120 deg
            const green = sin_to_hex(i, 2 * Math.PI * 2/3); // 240 deg
            colors[i] = `#${red}${green}${blue}`; 
        }
        timeout1h();
    });

function sin_to_hex(i, phase) {
    const sin = Math.sin(Math.PI / colors.length * 2 * i + phase);
    const int = Math.floor(sin * 127) + 128;
    const hex = int.toString(16);
    return hex.length === 1 ? `0${hex}`: hex;
}

async function timeout1h() {
    setTimeout(timeout1h, 1000 * 60 * 60);
  
    client.guilds.fetch("any guild_id")
        .then(async (guild) => {
            const role = await guild.roles.fetch("any role_id");
            role.setColor(colors[color_index]);
            color_index = color_index + 1 == colors.length ? 0: color_index++;
        }).catch(console.log);
}