This time zone converter doubles as a live world clock. The list starts with major world cities — and your own location, detected from your device — each showing its current local time, date and UTC offset, ticking in real time. Remove cities you do not need, add any of 40+ others, and set any city as the base that the others are compared against; cities on a different calendar day are marked +1 day or −1 day so nothing gets lost across the date line.
The real power is planning. Pick a date and drag the time slider: every city instantly shows what your chosen moment in the base city is over there. That is how you find a meeting time that is 9 AM in London without making it 2 AM in Sydney — or check whether a product launch at noon Pacific lands in the evening in Europe and the middle of the night in Asia. Daylight saving time is handled automatically by your browser's time zone database, including the awkward weeks when North America and Europe change their clocks on different dates.
How to use the converter
- The list opens in live mode, showing the current time in every city, updating each second.
- To plan, drag the time slider or change the date — live mode switches off and all cities convert your chosen moment in the base city.
- Click "Set as base" on any city to make it the reference; use ✕ to remove a city and the dropdown at the bottom to add more.
- Press "Now (live)" any time to jump back to the real current time.
- Check the +1 day / −1 day badges before scheduling — they flag cities where your moment falls on a different date.
Handy things to check
- Meeting planning: find the hour that overlaps working time in New York, London and Singapore.
- Calls with family abroad: see whether it is a reasonable hour before you dial.
- Launches and streams: convert a release time into every major market at once.
- Travel: preview the time difference and the date shift before a long-haul flight.
Frequently asked questions
How does it handle daylight saving time?
Conversions use the IANA time zone database built into your browser — the same data operating systems use — so DST starts, ends and exceptions (including zones like India and Nepal with half- and quarter-hour offsets) are applied automatically for the exact date you pick.
Why do some cities show +1 day or −1 day?
Because the world spans 24+ hours of offsets, your chosen moment can fall on a different calendar date in another city. The badge compares each city's date with the base city's date for the moment you selected.
Can I convert a time in the past or far future?
Yes — pick any date. Historical conversions use the rules in the database; note that far-future DST dates can change if governments change the rules, which happens from time to time.
Is my location shared anywhere?
No. Your time zone is read from your own device settings by your browser, and all conversions happen locally on this page. Nothing is sent to a server.