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timezone

A timezone converter translates a wall-clock time in one location into the equivalent time in another, accounting for the offset between zones plus daylight-saving-time transitions on each side — essential for scheduling cross-border meetings, watching live events, coordinating remote teams, and planning travel arrivals. The ZTools Timezone Converter covers 400+ major cities and 100+ named timezones (IANA database), updates DST rules through 2030, supports a multi-city "world clock" view, and emits a shareable link encoding the time and zones so meeting invites become unambiguous in any language.

Use cases​

Cross-border meeting scheduling​

"3pm London on Tuesday" — what is that in San Francisco, Mumbai, and Tokyo? One conversion shows all four times so the calendar invite is correct.

Live event watching​

A keynote streams "9am Pacific" — find the local equivalent and add it to the calendar with no mental math.

Remote-team daily standups​

A team across SF / NYC / Berlin / Bangalore needs one time that works for everyone. The world-clock view shows overlapping waking hours at a glance.

Travel itinerary​

Flight lands "8:45 PM local" — what is that back home? Quick conversion plus DST awareness avoids the "did my parents already go to bed" guess.

How it works​

  1. Pick the source location — Search by city name (London, New York, Tokyo) or timezone code (UTC+5:30, America/Chicago).
  2. Enter the time — Local wall-clock time at the source. Date matters because DST transitions shift the offset.
  3. Pick target locations — One or many. Each shows the equivalent local time and date (which may differ by ±1 from source).
  4. Inspect DST status — Each location shows whether DST is currently in effect and when the next shift happens.
  5. Share the calendar entry — Generate a shareable link OR an .ics file that encodes the meeting time correctly for every recipient's local zone.

Examples​

Input: 15:00 London (BST), 2026-05-05 → SF, NYC, Mumbai, Tokyo

Output: SF 07:00, NYC 10:00, Mumbai 19:30, Tokyo 23:00 (same date except Tokyo: also 2026-05-05)

Input: 09:00 New York (EDT) → Sydney

Output: 23:00 Sydney (next day) — 14-hour offset during US DST

Input: UTC noon → 5 cities

Output: London 13:00 (BST), Berlin 14:00, Mumbai 17:30, Tokyo 21:00, SF 05:00

Frequently asked questions​

How does DST work?

Most locations shift the local clock forward 1 hour in spring and back in autumn. Dates vary by country (US: 2nd Sunday in March / 1st Sunday in November; EU: last Sundays in March / October). The IANA tzdata captures all rules.

Why do India and Newfoundland have :30 offsets?

Historic / political timezone choices. India runs on UTC+5:30 nationally. Newfoundland on UTC-3:30. Calculations handle them like any other offset.

My city is not in the list

Type the timezone code instead (e.g. "Asia/Karachi", "Africa/Lagos"). All IANA zones are supported even if the city search misses.

What if I need a future-date conversion across a DST boundary?

The tool uses the published DST schedule. For dates beyond 2030 some rules may be tentative; double-check for any 5+ year forward planning.

Can I save a "world clock" of cities I care about?

Yes — pin cities; pinned set persists in your browser. Useful for distributed teams.

How do I make a calendar invite work for everyone?

Set the meeting time in your calendar in YOUR local zone with the timezone metadata attached. Modern calendar apps (Google, Outlook, Apple) auto-translate for each invitee. Avoid sending plain-text "3pm" without a zone.

Tips​

  • Always include the timezone abbreviation when typing meeting times in chat: "3pm BST" beats "3pm".
  • Pin your team's 4–5 most-common cities; the world clock saves repeat searches.
  • When scheduling across continents, watch out for the "next day" shift — Tokyo from morning London is the same calendar day, but Sydney is a day ahead.
  • For events that recur weekly, send an .ics — DST is handled automatically on each occurrence.
  • For long calls, glance at every participant's waking hours — what is 9am for you may be midnight for them.

Try it now​

The full timezone runs in your browser at https://ztools.zaions.com/timezone — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-05 · Author: Ahsan Mahmood · Edit this page on GitHub