What is a Timezone Converter & Meeting Planner?
A timezone converter takes a single moment in time and shows what the clock reads in many places at once. A meeting planner goes one step further: it lines those clocks up visually so you can see the window where everyone is awake and at their desk. This tool does both. Pick one reference moment, add the cities or regions your colleagues live in, and every row updates to show the matching local time — complete with the date, the day of the week, and the live UTC offset. Then a row of aligned 24-hour strips highlights each zone's working hours, turning the eternal "what time is good for you?" thread into a single glance.
Like every tool here, it runs entirely in your browser. There is no backend, no account, and no ads. All of the zone math is delegated to the browser's native Intl API, which ships with the full IANA time zone database. That means daylight saving time, half-hour and 45-minute offsets, and historical rule changes are all handled for you — you never hand-roll an offset or guess whether a region is currently on summer time.
How to Use the Converter
- Set a reference date and time with the datetime input, or press Now to anchor to the current moment. This time is interpreted in your own local zone.
- Add zones from the dropdown. It is populated from the complete IANA list your browser supports, so you can search for any region. Your local zone plus a few common ones are loaded by default.
- Drag the hour-of-day slider to sweep the reference time across a full day without retyping. Every zone and every strip moves together in real time.
- Read each row's local clock, date, and offset. Rows that roll over to the previous or next calendar day show the changed date, so you never schedule a call for someone's 3 a.m. by accident.
- Use the overlap strips to spot a shared working window, then press Copy share link to send the exact arrangement to everyone involved.
IANA Time Zones and DST
Time zone abbreviations like EST, PST, CET, or IST are convenient but dangerously ambiguous — "IST" alone can mean Indian, Irish, or Israel Standard Time, and "EST" tells you nothing about whether daylight saving is currently in effect. The industry-standard alternative is the IANA time zone database, where each zone is named by a representative location such as America/New_York, Europe/London, or Asia/Kolkata. Each identifier encodes the complete history and future schedule of that region's clock, including every daylight saving transition.
This converter uses IANA identifiers exclusively and resolves them through Intl.DateTimeFormat. When you scan a reference time across a daylight saving boundary, the offset displayed next to a zone changes on its own — for example New York flips between UTC−05:00 in winter and UTC−04:00 in summer — without any special handling on your part. Because the underlying value is always a single absolute instant (a JavaScript Date), the conversions stay internally consistent no matter how many zones you stack up.
Finding Overlap Across Zones
The hardest part of scheduling across continents is not converting one time — it is finding the band of times that is reasonable for everyone. That is what the 24-hour strips solve. Each strip represents a full day in one zone, and because all strips are pinned to the same absolute timeline, a single vertical column is the same instant everywhere. The highlighted cells mark that zone's working hours (9:00 to 17:00 local). Where the highlights from every strip line up in the same columns, you have found the hours that are inside working time for all participants at once.
In practice, the overlap between, say, San Francisco, London, and Tokyo is famously thin — sometimes only an hour or two, sometimes none, which is itself useful to know before you propose a slot. Slide the reference marker into the shared band and the readout at the top tells you how many overlapping working hours exist. If there is no overlap, that is a strong signal to record a message asynchronously rather than force someone onto a midnight call.
Sharing a Meeting Time
Every change you make is written into the page URL as you go, in the form ?z=UTC,America/New_York,Asia/Tokyo&t=2026-06-10T15:00. The z parameter is the comma-separated list of zones and t is the reference moment. Because the whole arrangement lives in the address bar, sharing is one click: press Copy share link or copy the URL and drop it in a calendar invite, chat, or email. When the recipient opens it, they see the identical instant translated into the identical set of zones — so a single link replaces a long back-and-forth about whose morning it is.
Common Uses
- Distributed teams — find a standup or all-hands slot that does not stick one region with a brutal hour.
- Client and interview calls — confirm a time across continents without ambiguity about AM/PM or which day.
- Launch and on-call coordination — line up release windows and handoffs across follow-the-sun rotations.
- Travel planning — see what time it will be back home when you land, and when colleagues are reachable.
- Live events and streams — publish a start time your global audience can translate at a glance.
Frequently Asked Questions
How do I convert a time between time zones?
Pick a reference date and time at the top of the page, then add the zones you care about from the dropdown. Each row instantly shows that same instant rendered in its local wall-clock time, along with the date, day of the week, and the current UTC offset. Changing the reference time updates every zone at once.
Does this tool handle daylight saving time?
Yes. All conversions use the browser's built-in Intl API, which knows the full IANA time zone database including historical and future daylight saving transitions. When you cross a DST boundary the offset shown next to each zone updates automatically, so you never have to remember whether a region is currently on summer or winter time.
How do I find a meeting time that works for everyone?
Each zone has a horizontal 24-hour strip with working hours highlighted. Because the strips are aligned to the same absolute timeline, the columns where every strip is highlighted at once are the hours that fall inside working time for all participants. Slide the reference time until the marker lands inside that shared band.
Can I share a meeting time with other people?
Yes. The selected zones and the reference moment are encoded into the page URL as you work, for example ?z=UTC,America/New_York,Asia/Tokyo&t=2026-06-10T15:00. Press Copy share link and send it. When a recipient opens it they see the exact same instant translated into the same set of zones, so everyone is looking at one agreed-upon time.
What is an IANA time zone name?
IANA time zone names look like America/New_York or Asia/Tokyo and identify a region whose clocks have always moved together. They are preferred over abbreviations like EST or PST because abbreviations are ambiguous and do not capture daylight saving rules. This tool uses IANA identifiers throughout so conversions stay correct year-round.
Is my data sent to a server?
No. The entire converter runs in your browser using native JavaScript date and Intl APIs. Your chosen zones and reference time live only in the page URL and in memory. Nothing is uploaded, logged, or stored remotely. The only data that ever leaves your device is the share link you choose to copy and send.