Antarctica/Mawson. The UTC offset is always UTC+5 — this timezone does not observe daylight saving time.Antarctica/Mawson. Use this string in programming languages and APIs: JavaScript (`new Intl.DateTimeFormat('en-US', { timeZone: 'Antarctica/Mawson' })`), Python (`pytz.timezone('Antarctica/Mawson')`), or any IANA-compatible library.