Time Zone Converter & World Clock
Convert any date and time across 45 cities, watch a live world clock with daylight saving handled automatically, and plan meetings in your browser.
Built for the moments when you need an answer fast: what time is it for the team in Berlin right now, and if we start at 9 a.m. Pacific on Thursday, what does that mean in Singapore and London? Pick your cities once, switch between a live world clock and a converter for a specific date and time, and let the browser's time zone database take care of daylight saving and date changes.
// Time Zone Converter & World Clock: Features
Two modes: live clock and time conversion
In Live mode every city you have added shows its current time and date, refreshing every 30 seconds, so the page works as an always-on world clock. In Convert mode you enter a date, a time and the city that time belongs to, and every other card updates to show the same instant locally. Switching from one to the other is a single click, and clicking "Set as base" on any card makes that city the reference for the conversion.
45 cities across every region
The default set is Tokyo, New York, Los Angeles, London, Paris, Shanghai, Singapore and UTC. Use "+ Add city" to pick from 45 locations grouped by region: North America (New York, Chicago, Denver, Los Angeles, Anchorage, Honolulu, Toronto, Vancouver, Mexico City), Latin America, Europe from London to Moscow and Istanbul, Africa, the Middle East and South Asia, East and Southeast Asia, Oceania and UTC. The picker filters by city name, region or IANA zone ID such as America/Denver, and any card can be removed again with its × button.
Daylight saving time handled for you
Each card shows the zone abbreviation and UTC offset that apply at the displayed instant, so New York reads EST and UTC-5 in January but EDT and UTC-4 in July, and London switches between GMT and BST. The calculations use the browser's built-in Intl API and its IANA time zone data, which means the transition dates are the real ones for the year you pick, including future or past dates in Convert mode. Zones without DST, such as Tokyo, Shanghai, Singapore and Dubai, simply keep their fixed offset.
Date changes and working hours at a glance
When a converted time lands on a different calendar day than the base city, the card is labelled "next day" or "previous day", which prevents the classic mistake of booking a Friday evening call that is actually Saturday morning for the other side. A small indicator also classifies each city's local time as morning (6-9), business hours (9-18), evening (18-22) or night (22-6), so you can see instantly who is at their desk and who is asleep before you send that message. For recurring jobs rather than meetings, the Cron Expression Parser reads the schedule and this tool translates the run time into local clocks.
Your city list is remembered, and nothing is uploaded
The list of cities and the last mode you used are stored in your browser's local storage, so the page opens exactly as you left it. No account is needed and none of your choices are sent anywhere; all time math happens on your device. A Reset button restores the default eight cities whenever you want to start over. Durations are a separate question from wall-clock times: to convert hours to minutes or days to hours, use the Unit Converter, whose time category handles elapsed time rather than time of day.
// Time Zone Converter & World Clock: FAQ
How do I find out what time a meeting will be in another city?
- Switch to Convert mode, enter the date and time of the meeting, and choose the city that time refers to from the dropdown. Every other card immediately shows the corresponding local time, together with a "next day" or "previous day" label if the date differs. If a colleague's city is missing, add it with "+ Add city" first; the new card joins the conversion right away.
Does the converter account for daylight saving time?
- Yes. The tool relies on the browser's Intl API, which carries the IANA time zone database, so DST start and end dates are applied for the exact date you enter. The United States changes on the second Sunday of March and the first Sunday of November, the EU and UK on the last Sundays of March and October, and the abbreviations on the cards switch accordingly (EST to EDT, GMT to BST, CET to CEST). Zones without DST keep a constant offset.
Why does a card say "next day" or "previous day"?
- Because the same instant can fall on different calendar dates in different places. At 11 p.m. Monday in Tokyo it is 7 a.m. Monday in Los Angeles but already midnight Tuesday in Sydney. The label compares each city's date with the date in the base city so you never mistake the day of a call or a release window.
Can I convert a Unix timestamp?
- Not directly; Convert mode takes a calendar date and a clock time. If you have an epoch value from a log or an API, convert it to a date first and enter that as the base time with UTC selected as the base city. Token expiry times are a common case: the JWT Decoder turns the exp claim into a readable date that you can then translate for each region here.
How do I see when a UTC cron job runs in my local time?
- Select UTC as the base city in Convert mode (it is part of the default set), enter the scheduled time, and read the local time from your own city's card. Because DST is applied per date, a job fixed at 02:00 UTC will correctly show as 22:00 or 21:00 Eastern depending on the time of year, which is exactly the kind of drift that surprises on-call engineers.
Is the city list synced between my devices?
- No. The list of cities and the selected mode live only in the local storage of the browser you are using. Opening the tool in another browser or on another device starts from the default eight cities. There is no account or cloud sync, which also means nothing about your setup is transmitted.
My city is not in the list. What can I do?
- The picker offers a curated set of 45 major cities rather than every IANA zone. Choose a city in the same time zone as yours; for example, Vancouver covers the whole Pacific zone of Canada and the US West Coast, and Berlin covers most of Central Europe. Because the time is computed from the zone rather than the city name, the result is identical.
Do past and future dates work correctly?
- Yes. Convert mode builds the instant from the date and time you type using the time zone rules that were, or will be, in force on that date. You can check what time a historic incident happened in another region or plan a launch months ahead across a DST boundary, and each card will show the correct offset and abbreviation for that day.
Does it work on a phone?
- Yes. The layout is responsive: cards stack in one or two columns on a phone and spread to four or more columns on a desktop. The date and time inputs use the native pickers of your device, and the city picker is searchable so you can add locations quickly on a small screen.
Is any of my data sent to a server?
- No. Current times, conversions and DST rules are all computed in your browser. The only thing stored is your list of cities and your chosen mode, and that stays in the browser's local storage on your device.
// How to Use Time Zone Converter & World Clock
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Check the world clock
Open the tool and Live mode shows the current time and date in the default eight cities, refreshing every 30 seconds. Use "+ Add city" to pick more locations from the searchable list of 45, and remove any card with its × button.
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Convert a specific date and time
Click "Convert time", enter the date and time, and choose the city that time belongs to. All other cards update to that instant, showing the local time, the current zone abbreviation and offset, and a next-day or previous-day label where the date differs. "Now" resets the base time to the current moment.
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Change the base city
Pick a different base city from the dropdown or press "Set as base" on any card to see the same schedule from that city's point of view. Your city list and mode are saved automatically for the next visit.
Category Utilities