Timezone Converter

A simple, accurate timezone converter for distributed teams

PocketWebTools' timezone converter is a free tool for converting times between any of the world's 400+ IANA timezones (IST, PST, EST, GMT, JST, CET, AEST) and every regional variant in between. Use it to find a meeting time that works for everyone, plan a launch, schedule a call with a remote teammate, or just see what time it is in another city right now.

Daylight saving transitions, country-specific rules and historical changes are all handled automatically. Your selected zones are remembered between visits so the converter opens with your usual cities next time.

How to use it

1. Add your timezones from the search at the bottom of the panel. You can search by city (Mumbai, Tokyo, Berlin) or abbreviation (IST, JST, CET).
2. See current local time across every added zone, refreshed every second. The bands also show the date when zones cross midnight.
3. Scrub the timeline to preview a different moment in one zone. The others update in lock-step so you can find a slot that works for everyone.
4. Reorder zones by drag-and-drop to put your home zone (or your customer's) at the top.
5. Remove zones with the × on each card. Your selection is saved locally for next time.

Common use cases

• Distributed teams. Find a meeting slot that doesn't ask anyone to dial in at midnight. Especially useful across IST↔PST, GMT↔IST, EST↔CET, AEST↔GMT.
• Client work & freelancing. Quote deadlines in your client's local time so "end of day Friday" means the same thing to both of you.
• Travel planning. Work out arrival times in local time and see overlap windows for catching family back home.
• Live events & launches. Convert a launch slot or sports match start time into every audience's local time without mental arithmetic.
• Trading hours. See when major exchanges (NYSE, LSE, TSE, HKEX) overlap with your working day.
• On-call rotations. Sanity-check a handoff time or an incident timestamp against another responder's zone.

Popular conversions

Any pair from the IANA list works. The most-searched conversions we cover include:

• IST to PST
• IST to EST
• IST to GMT
• IST to CET
• PST to IST
• PST to EST
• EST to IST
• EST to GMT
• EST to CET
• GMT to PST
• GMT to IST
• GMT to JST
• UTC to local
• JST to PST
• JST to GMT
• CET to EST
• CET to PST
• AEST to GMT
• London to New York
• London to Tokyo
• New York to London
• San Francisco to London
• Mumbai to San Francisco
• Sydney to London

Why the IANA database matters

A timezone is not just a fixed offset from UTC; it's a set of rules about when the local clock changes, including daylight saving boundaries, historical shifts and political changes. The IANA timezone database (sometimes called the "tz database") is the canonical source for those rules and is what every major operating system, programming language and cloud database relies on.

That means when you scrub the slider to a date in late March or early November, the converter accounts for the spring-forward and fall-back transitions correctly, even for zones that no longer observe DST, like most of India and Russia, or zones with unusual half-hour or 45-minute offsets such as IST (+5:30) and Nepal Time (+5:45).

Frequently asked questions

What does this timezone converter do?

It shows the current time in any city or timezone you add to the list, lets you scrub a slider to see what a given moment in one zone is in every other zone, and helps you find a meeting time that works in all of them. Add or remove zones as needed.

Does it handle daylight saving time automatically?

Yes. We use the IANA timezone database (the same one operating systems and major databases use), so DST transitions, historical changes and country-specific rules are handled correctly. New York will stay on EST or EDT depending on the date you scrub to.

How many timezones are supported?

All 400+ IANA zones, covering every country, region and city the standard knows about. You can search by city name (London, Tokyo, Mumbai) or by abbreviation (GMT, JST, IST, PST, EST).

Why are there sometimes two zones with the same abbreviation?

Because abbreviations like 'IST' are ambiguous; they can mean Indian Standard Time, Irish Standard Time or Israel Standard Time depending on context. The converter uses the unambiguous IANA name underneath (Asia/Kolkata, Europe/Dublin, Asia/Jerusalem) so you always get the right offset.

Is the time accurate?

Yes. The converter reads your device clock and applies the correct timezone offset. If your laptop or phone clock is correct, the converter will be too.

Are my saved timezones synced across devices?

No. Your selected zones, ordering and any pinned reference time are stored only in your browser's localStorage. There is no account and no cloud sync. To use the same setup on another device, set it up there too.

Does it work offline?

Yes. The whole converter is local JavaScript and does not need a network connection after the first load. Your browser's clock and timezone tables provide everything we need.

Can I share a specific time with someone?

Today the page shows live local time and a time you scrub to. Shareable URLs (e.g. a link that opens directly to '3pm London on June 12 across these five zones') are on the roadmap.