I find it easiest to create the date in local timezone using something like moment-timezone, convert it to UTC and then use the startInputType parameter e.g.

const ics = require('ics');
const moment = require('moment-timezone');

const event = {
	start: moment.tz("2013-11-18 22:30", "Asia/Taipei").utc().format('YYYY-M-D-H-m').split("-").map(val => parseInt(val)),
	startInputType: 'utc',
	duration: { hours: 1, minutes: 0 },
	title: 'My timezone event',
}

const { error, value } = ics.createEvent(event);

console.log(value);

This outputs:
_
BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:adamgibbons/ics
METHOD:PUBLISH
X-PUBLISHED-TTL:PT1H
BEGIN:VEVENT
UID:VVE_R4SY-k9OID55TkGZc
SUMMARY:My timezone event
DTSTAMP:20210827T172400Z
DTSTART:20131118T143000Z
DURATION:PT1H
END:VEVENT
END:VCALENDAR
_

As you can see, the DTSTART entry ends with Z to indicate it is in UTC / Zulu time, which makes it explicit exactly when the event starts. Client software will then typically convert this back to the user's local timezone before it is displayed.

how to add timeZones ? #198

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