Script for a slack app sending a daily bot message thatannounces the Daily animator

dailybot.gs

const scriptProperties = PropertiesService.getScriptProperties()
const WEBHOOK_URL = scriptProperties.getProperty('WEBHOOK_URL')

const COLLEAGUES = [
	{
		name: 'Hanna',
		slackID: '...',
	},
	{
		name: 'Martin',
		slackID: '...',
	},
	{
		name: 'Script',
		slackID: '...',
	},
]

function checkIfWeekEnd() {
	const day = new Date().getDay()
	return day == 0 || day == 6
}

function sendMessage() {
	const isWeekEnd = checkIfWeekEnd()
  	if (isWeekEnd) return

	const daysSinceEpoch = Math.floor(new Date() / (1000 * 60 * 60 * 24))
	const index = daysSinceEpoch % COLLEAGUES.length

	const colleague = COLLEAGUES[index]

	const message = `Today's Daily Animator is <@${colleague.slackID}>! :microphone:`

	const payload = {
		blocks: [
			{
				type: 'divider',
			},
			{
				type: 'section',
				text: {
					type: 'mrkdwn',
					text: message,
				},
			},
			{
				type: 'divider',
			},
			{
				type: 'context',
				elements: [
					{
						type: 'mrkdwn',
						text: 'Join the daily at 9:15 <https://meet.google.com/whatever|here>.',
					},
				],
			},
		],
	}

	const options = {
		method: 'POST',
		contentType: 'application/json',
		payload: JSON.stringify(payload),
	}

	UrlFetchApp.fetch(WEBHOOK_URL, options)
}