Enter a valid date and time to build the planner.
A Time Zone Converter takes a wall-clock reading in one place — 9:00 AM on 12 March in New York — and tells you what the clock says at that same instant somewhere else. It is not simple arithmetic, because the gap between two zones is not a constant. New York is five hours behind London for most of the year and four hours behind for part of it, and for two weeks in spring the gap is four hours because the United States changes its clocks before Europe does.
This converter resolves every offset through the IANA time zone database that ships with your browser, evaluated at the specific instant you entered. That means daylight saving transitions, half-hour and quarter-hour offsets like India (UTC+05:30) and Nepal (UTC+05:45), and countries that have changed their rules are all handled by the same code path — nothing is hardcoded and nothing goes stale.
Alongside the conversion you get each zone's UTC offset and abbreviation for that date, the signed difference between the two, and a meeting-planner strip that lays the same instant across several zones at once so you can see which hour lands inside everybody's working day. Everything runs in your browser: no dates are uploaded, nothing is logged, and the tool keeps working offline once the page has loaded.
Choose the city you are converting from, then enter the date and the 24-hour time as it reads on the clock there. Press "Now" to load the current moment instead of typing it.
Choose the city you want the answer in. The converted date and time appear immediately, along with the UTC offset and zone abbreviation that apply on that specific date.
The panel shows each zone's offset from UTC and the signed difference between them — for example "Dhaka is 10 hours ahead of New York". Use the swap button to reverse the direction.
Add zones to the planner strip to see the same instant in every one, with working hours shaded. Copy just the converted time or the full expression to paste into a calendar invite or a message.
Offsets are resolved for the exact date you enter, so a March meeting and a July meeting between the same two cities can correctly produce different gaps. No hardcoded offset tables to go stale.
The cities people actually schedule around, grouped by region and labelled with their country, with the full IANA identifier shown so you can paste it straight into code.
One row per zone, one cell per hour around your instant, with working hours shaded and next-day or previous-day cells marked. Find the hour that works for everyone without doing the arithmetic.
India at UTC+05:30, Nepal at UTC+05:45, Adelaide at UTC+09:30, Chatham at UTC+12:45 — half-hour and quarter-hour zones are as ordinary here as whole-hour ones.
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