America/Argentina/Buenos_Aires. The UTC offset is always UTC-3 — this timezone does not observe daylight saving time.America/Argentina/Buenos_Aires. Use this string in programming languages and APIs: JavaScript (`new Intl.DateTimeFormat('en-US', { timeZone: 'America/Argentina/Buenos_Aires' })`), Python (`pytz.timezone('America/Argentina/Buenos_Aires')`), or any IANA-compatible library.