Atlantic/Reykjavik. The UTC offset is always UTC+0 — this timezone does not observe daylight saving time.Atlantic/Reykjavik. Use this string in programming languages and APIs: JavaScript (`new Intl.DateTimeFormat('en-US', { timeZone: 'Atlantic/Reykjavik' })`), Python (`pytz.timezone('Atlantic/Reykjavik')`), or any IANA-compatible library.