America/Port-au-Prince. The standard UTC offset is UTC-5 (EST) in winter and UTC-4 (EDT) during daylight saving time.America/Port-au-Prince. Use this string in programming languages and APIs: JavaScript (`new Intl.DateTimeFormat('en-US', { timeZone: 'America/Port-au-Prince' })`), Python (`pytz.timezone('America/Port-au-Prince')`), or any IANA-compatible library.