Autoreply Gmail out of office hours

script.gs

function autoReply() {
	var interval = 5;
	var wkend = [6,0];
	var wkendMessage = "Hi! Thank you for contacting me. I'm currently out of office. All emails we'll be replied approximately on next Monday.";
	var wkdayMessage = "Hi! Thank you for your email. I'm currently offline. I'll be back Mon-Fri 9-6PM UTC+2. You are getting this email because it is outside business hours.";
	var date = new Date();
	var day = date.getDay();
	var hour = date.getHours();

	if (wkend.indexOf(day) > -1 || (day == 5 && hour >= 18)) {
		var timeFrom = Math.floor(date.valueOf()/1000) - 60 * interval;
		var threads = GmailApp.search('is:inbox after:' + timeFrom);
		for (var i = 0; i < threads.length; i++) {
			threads[i].reply(wkendMessage);
		}
	}
	else if (hour < 9 || hour >= 18) {
		var timeFrom = Math.floor(date.valueOf()/1000) - 60 * interval;
		var threads = GmailApp.search('is:inbox after:' + timeFrom);
		for (var i = 0; i < threads.length; i++) {
			threads[i].reply(wkdayMessage);
		}
	}
}