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live offsets · IANA · grouped · live

Every current UTC offset with example zones

Group the IANA database by current offset. See the offsets in use today (including half-hour and 45-minute ones) with example zones for each.

UTC Offset List
Offsets
24
distinct
Zones
53
IANA
Fractional
4
non-hour
Mode
live
today
Snapshot2026-09-26T17:05:25Z
input · today
Snapshot date
Sat Sep 26 2026
About
Offsets reflect today's DST state. Half-hour (India, Nepal) and 45-minute (Pacific/Chatham) offsets are real and active.
output · groups
UTC-10:00
Pacific/Honolulu
UTC-08:00
America/Anchorage
UTC-07:00
America/Los_Angeles, America/Vancouver, America/Phoenix
UTC-06:00
America/Denver, America/Mexico_City
UTC-05:00
America/Chicago, America/Bogota
UTC-04:00
America/New_York, America/Toronto
UTC-03:00
America/Halifax, America/Argentina/Buenos_Aires, America/Sao_Paulo
UTC+00:00
Atlantic/Reykjavik, UTC
UTC+01:00
Europe/London, Europe/Dublin, Europe/Lisbon
UTC+02:00
Europe/Paris, Europe/Berlin, Europe/Madrid, Europe/Rome, Europe/Amsterdam, Europe/Brussels, Europe/Zurich, Europe/Stockholm
UTC+03:00
Europe/Helsinki, Europe/Athens, Africa/Cairo, Europe/Istanbul, Europe/Moscow
UTC+03:30
Asia/Tehran
UTC+04:00
Asia/Dubai
UTC+05:00
Asia/Karachi
UTC+05:30
Asia/Kolkata
UTC+05:45
Asia/Kathmandu
UTC+06:00
Asia/Dhaka
UTC+07:00
Asia/Bangkok, Asia/Jakarta
UTC+08:00
Asia/Singapore, Asia/Manila, Asia/Hong_Kong, Asia/Shanghai, Asia/Taipei, Australia/Perth
UTC+09:00
Asia/Seoul, Asia/Tokyo
UTC+09:30
Australia/Adelaide
UTC+10:00
Australia/Sydney, Australia/Brisbane
UTC+12:00
Pacific/Fiji
UTC+13:00
Pacific/Auckland
Quick Start

How the grouping works

We iterate every IANA zone and bucket it by today's offset. The buckets are sorted so the earliest (UTC-12) appears first and UTC+14 last.

  1. 01

    Read offsets

    Every distinct offset present in the world today shows as a row.

    Parsing accepts ISO 8601, RFC 3339, RFC 2822, and Unix epoch seconds/milliseconds. The Date constructor handles the rest with browser-engine consistency.

    offsetsISO 8601RFC 3339epochlive
    list · timestamptoday · ISO
    UTC-12 → UTC+14
    loaded · ISO 8601zone · ready
  2. 02

    DST included

    Zones currently in DST sit under their shifted offset (e.g. America/New_York under -04:00 in summer).

    All math runs in UTC internally to avoid DST landmines; presentation converts back to the user’s zone via Intl.DateTimeFormat.

    dstUTC mathIntlDST-safelive
    EDT · options-04:00 · live
    America/New_York · UTC-04
    options applied · UTCDST-safe
  3. 03

    Fractional offsets

    India (+05:30), Nepal (+05:45), Chatham (+12:45) all surface.

    Output respects the chosen timezone offset (Z vs +05:30) and pads digits per ISO conventions so sorts stay chronological.

    fractionaloffsetzone-awaresortablepadded
    +05:30 · computedAsia/Kolkata · ready
    UTC+05:30
    computed · instantsortable
  4. 04

    Copy all

    One click puts the entire table on your clipboard.

    Copy writes via the Async Clipboard API; nothing pings a time server — the browser’s clock is the only oracle.

    copyclipboardno oracledeterministicclient-side
    ✓ · copiedready · done
    ✓ Copied
    shipped · ready to shipsuccess
Pro tips

Time math without DST landmines

Always store UTC

Convert to local for display only. UTC storage avoids DST jumps and timezone drift in databases.

Watch leap seconds

POSIX time doesn’t count leap seconds; some systems do. Don’t use timestamps for sub-second precision across boundaries.

Prefer Temporal eventually

The Date API has many quirks. Temporal is shipping in modern engines and handles zones correctly.

Cron is timezone-tricky

Cron expressions run in the daemon’s local zone unless told otherwise. Pin a TZ explicitly for predictable runs.

ISO 8601 sorts naturally

YYYY-MM-DDTHH:mm:ss sorts correctly as a string. Don’t use US-style MM/DD/YYYY for anything machine-readable.

Beware Y2K38

Signed 32-bit Unix timestamps overflow in 2038. Use 64-bit storage end-to-end for long-lived systems.

Related toolsTZ FinderWorld ClockMeeting PlannerTZ ConverterDST CheckerISO 8601
Use Cases

When to look up offsets

Storage, scheduling, edge cases.

Database storage

Confirm UTC normalization covers all real offsets. Math runs in UTC under the hood to dodge DST jumps — local time is only for display. That means scheduling logic and date diffs survive March / November fall-back without the classic off-by-one-hour bug.

DST-safe

Scheduling code

Spot edge cases like +05:45 before shipping. Browser clock is the only source — no external time server, no privacy leak, no rate limit. Pair with NTP-synced server time for high-accuracy use cases, but for human-scale work the browser clock is plenty.

UTC-correct

QA testing

Build a test matrix that includes fractional offsets. ISO 8601 output sorts naturally as strings, perfect for filenames (report-2026-01-15.pdf) and log lines that need chronological ordering without parsing. Drop into S3 keys for free time-bucketing.

ISO-sortable

Library audit

See if your library handles +12:45 (Chatham). Pairs cleanly with cron, scheduled tasks, and timestamped log analysis. The tool's output drops directly into APScheduler, Linux cron, or GitHub Actions schedule expressions without re-formatting.

spec-grade

Trivia

How many offsets exist? Right now…. Output respects the chosen timezone offset (Z vs +05:30) so REST APIs and database TIMESTAMP WITH TIME ZONE columns round-trip cleanly. No ambiguity between "noon UTC" and "noon local".

zone-aware

Travel ops

Plan flights around odd offsets at destination. Confirms the difference between epoch seconds (10 digits) and milliseconds (13 digits) before you commit code that mis-multiplies by 1000 — a classic bug in cross-language time handling.

epoch-accurate
FAQ

Frequently asked questions

Nepal uses it. Real and active.
Yes, twice a year as DST rolls on and off in major regions.
No — offsets are quantised to minutes in the IANA database.
Look for Europe/London, Atlantic/Reykjavik or the UTC entry depending on the day.
No. The whole list is grouped locally in your browser.
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