A fast, private world clock
Keeping track of the current time around the world is essential for remote work, international travel, and staying connected with friends and family abroad. This world clock provides a customizable dashboard where you can monitor the time in different cities simultaneously. By comparing global time zones directly against your local time, you can easily figure out when someone on the other side of the planet is awake, working, or asleep.
Because this tool runs entirely in your browser, it is completely private. It reads your system's clock to establish your local time and calculates global offsets using built-in browser data. No location data or personal preferences are ever uploaded to a server.
Features of this world time zones clock
Customizable dashboard. The tool starts with a default list of major global hubs like New York, London, Tokyo, and Sydney. You can easily remove these and search for specific cities or IANA time zones to build a dashboard tailored exactly to your needs.
Persistent storage. Once you set up your preferred list of cities, the tool saves your configuration to your browser's local storage. The next time you open the page, your custom clocks will be exactly where you left them.
Relative time differences. Next to each city, the clock displays exactly how many hours ahead or behind that location is compared to your local time (for example, +5.5 hr or −3 hr). It also shows the standard UTC offset for quick reference.
Day and night indicators. A quick glance at the sun or moon icon tells you if it is daytime (between 6:00 AM and 6:00 PM) or nighttime in a given city. The card styling also highlights your local time zone so you always have a clear baseline.
Flexible formatting. Whether you prefer the standard AM/PM format or military time, you can instantly toggle all clocks between 12-hour and 24-hour displays.
Managing international time
Coordinating remote teams. When your team is scattered across North America, Europe, and Asia, scheduling a meeting that works for everyone can be challenging. By adding your colleagues' cities to the dashboard, you can quickly find overlapping business hours without doing mental math. If you need to plan a meeting for a future date rather than checking the current time, try the Time Zone Converter.
Planning international travel. Jet lag and flight itineraries can make it difficult to know what time it is back home. Load your destination and your home city into the clock before you travel. You will always know the exact time difference, making it easier to call home at a reasonable hour.
Following global events. Whether you are waiting for a live sports broadcast, a global product launch, or an international financial market to open, a world clock helps you track exactly when the event begins in your local time. If you want to count down to a specific event, you can use the Countdown Timer alongside this tool.
How time zones and offsets work
Global time is coordinated around UTC (Coordinated Universal Time). Every location on Earth is assigned an offset from UTC, usually in full hours, though some regions use 30-minute or 45-minute increments. For example, London is UTC+00:00 (during standard time), New York is UTC−05:00, and Kolkata is UTC+05:30.
This tool uses the IANA Time Zone Database, which is the standard system used by modern computers and web browsers. This database maps geographical regions (like Europe/Paris or America/New_York) to their respective time rules.
One of the biggest advantages of relying on the IANA database is that it automatically handles Daylight Saving Time (DST). When a region shifts its clocks forward in the spring or backward in the autumn, the browser's internal data adjusts the offset automatically. You never have to wonder if a specific country has started observing DST yet—the clock simply displays the correct, current time.