Pacific/Rarotonga. The UTC offset is always UTC-10 — this timezone does not observe daylight saving time.Pacific/Rarotonga. Use this string in programming languages and APIs: JavaScript (`new Intl.DateTimeFormat('en-US', { timeZone: 'Pacific/Rarotonga' })`), Python (`pytz.timezone('Pacific/Rarotonga')`), or any IANA-compatible library.