Timezone Converter
Pick a date and time in your zone and see it across 60+ world cities side by side, with working-hours color coding. Also works as a plain time zone converter for one-off timezone conversion.
Pick a time
How this is calculated
This tool reads each city's current UTC offset directly from your browser's built-in IANA timezone database (the same data your operating system uses), rather than a hardcoded offset table. That matters because most offsets aren't fixed year-round — daylight saving time shifts them by an hour twice a year, on different dates in different countries, and a few countries change their rules entirely from time to time. Reading live tzdata means the conversion stays correct through those changes without needing to be manually updated.
Working-hours color coding
Each city is flagged green for typical business hours (9am–5pm local time), amber for early morning or evening (7–9am or 5–9pm), or red for outside working hours — a fast way to scan a long list of cities for who's actually reachable at the time you picked, without doing the math for each one individually.
Why the date sometimes changes, not just the time
Once a UTC offset crosses about 12 hours in either direction, converting to another zone can push the local time to the previous or next calendar day — this is normal and is why each city's result also shows its date, not just its time. A 9am Monday meeting in San Francisco is already Tuesday morning in Tokyo and Sydney, which is easy to miss if you only look at the clock time.
Frequently asked questions
Why did a city's offset change from what I remember?
Almost always daylight saving time. Most of the US and Europe observe it (springing forward, falling back, on different dates from each other), while most of Asia, most of Africa, and parts of Australia don't — so the gap between, say, New York and London actually changes by an hour for a few weeks each spring and fall while the two regions' DST transitions are out of sync.
What's the best overlap window for a US–Europe–Asia meeting?
There usually isn't a clean one — US Pacific/Eastern, Central Europe, and East Asia business hours barely overlap at all. The common compromise is a time that's late morning in Europe and evening in the US West Coast (catching Asia early the next morning if at all), or rotating which region takes the inconvenient slot each time. Pick your time above and scan for the fewest red cells.
Why does my browser's detected timezone sometimes look wrong?
Browser timezone detection uses your device's OS-level timezone setting, which can be wrong if you've traveled recently without updating it, or if you're on a VPN that doesn't affect the OS clock. Use the timezone dropdown to pick the correct zone manually if "Use my browser's timezone" gives an unexpected result.
Does this account for countries that don't observe daylight saving time?
Yes — since offsets are read from live timezone data rather than assumed, countries and regions that skip DST (most of Asia, most of Africa, Arizona in the US, and others) are handled correctly without any special-casing.