Time Zone Converter with Meeting Planner
Convert a date and time between cities and time zones, with daylight saving time, 30- and 45-minute offsets, day changes and a meeting planner grid.
Related tools
All Dates & time tools →A webinar is announced for 3:00 PM Paris time on August 15: when should people in New York, Los Angeles or Tokyo join? This converter answers for the date you pick, not for today, and that is the whole point: the gap between two cities shifts with the seasons, and on clock-change nights some times never happen while others happen twice. You set a starting city, a date and a time; every city you add shows its own time, date and gap straight away. The 24-hour grid then helps you find a slot that works for everyone, and the copied link opens the same conversion for whoever receives it.
How to use it
- In “From (city or time zone)”, choose the reference city: with the field empty, the list offers “My time zone”, UTC and the main cities; you can also type an IANA zone name such as Asia/Tokyo.
- Set the “Date” and “Time”; at first the tool fills in the next full hour in the starting city, and “Now” switches to the present moment there.
- Add the cities to convert with “Add a city or time zone” (twelve at most), then reorder them with ↑ ↓ or remove them with ×.
- Read each card: local time, full date, a “+1 d” or “−1 d” badge when the city is on another day, UTC offset and gap with the starting point.
- To set up a meeting, click a column in the “Meeting planner”: green cells mark working hours (9:00–18:00), gray ones the night (0:00–6:00), and the column's hour becomes the starting time.
- Click “Swap” to exchange the starting point and the first city at the same instant, then “Copy link” to share the conversion.
How a time travels from one city to another
The converter never adds hours. The starting date and time are first turned into a single instant, using the IANA time zone rules that apply in that city on that date; each city then reads that instant on its own clock. A January date therefore gets winter offsets and an August date summer ones, with no table of fixed values, and the gap shown is the difference between the two offsets at that exact instant.
Clock-change nights get special handling. If the chosen time falls in the gap left when clocks go forward, a warning says so and the tool uses the time reached after the same elapsed time, one hour later for a one-hour jump. If the time occurs twice when clocks go back, it asks which occurrence you mean, each labelled with its offset. The exact moment of the jump is found by bisection in the database itself, not deduced from a rule such as “last Sunday in March”, which only holds in part of the world.
The planner grid always has 24 columns, one per hour of the starting day, and each is converted on its own. On March 29, 2026, in Paris, column 02 is marked as non-existent and points to the same instant as 03; on October 25, it is marked as doubled and shows the first pass. Each row gives one city's local time: green for 9:00–18:00, gray for 0:00–6:00, and a vertical line where the date changes. Accepted dates run from 1900 to 2100.
Where the converter saves you a mistake
- Announcing a webinar or live stream to an international audience: one conversion gives the time for London, Los Angeles and Tokyo, ready to paste into the invitation.
- Finding a meeting slot across several offices: the grid shows at a glance the hours when each city is within working hours.
- Planning a long-haul flight: convert the arrival time, given in the destination's local time, to see what time it will be at home and tell whoever is waiting.
- Meeting a deadline set in another time zone: applications closing at 11:59 PM New York time already fall in the early hours of the next day in Europe.
- Scheduling a night shift or an alarm on a clock-change night: the tool flags whether the chosen time doesn't exist that day or happens twice.
- Sending the conversion in a chat or a shared calendar: the copied link reopens the same cities, date and time.
Conversions checked step by step
Each result below is what the tool's engine returns for these inputs, written the way the screen displays it.
- Paris, Saturday, August 15, 2026, 03:00 PM: New York shows 09:00 AM (UTC−4, −6 h), Los Angeles 06:00 AM (UTC−7, −9 h) and Tokyo 10:00 PM (UTC+9, +7 h). At the same instant, New Delhi reads 06:30 PM (UTC+5:30, gap +3 h 30) and Kathmandu 06:45 PM (UTC+5:45, gap +3 h 45).
- Paris, August 15, 2026, 11:30 PM: Tokyo shows 06:30 AM on Sunday, August 16, 2026 with the +1 d badge, Sydney 07:30 AM (also +1 d), while Los Angeles is at 02:30 PM on Saturday, August 15.
- Paris, March 29, 2026, 02:30 AM: the tool warns “02:30 AM doesn't exist on March 29, 2026: clocks jump from 02:00 AM to 03:00 AM. Time used: 03:30 AM.” New York then shows 09:30 PM on Saturday, March 28 (−1 d) and Tokyo 10:30 AM.
- Paris, October 25, 2026, 02:30 AM: the tool reports “02:30 AM happens twice on October 25, 2026: clocks go back from 03:00 AM to 02:00 AM.” and offers “First occurrence (UTC+2)”, which gives 08:30 PM in New York on Saturday, October 24, or “Second occurrence (UTC+1)”, which gives 09:30 PM.
What the converter can't do
- Results follow the version of the time zone database that ships with your browser. When a government announces a rule change shortly before it takes effect, a browser that hasn't been updated yet converts with the old rule.
- For old dates, especially before 1970, the database's maintainers are still correcting zone history, and two browsers can disagree by an hour; dates before 1900 or after 2100 are refused.
- The copied link carries the cities, date and time in plain text. A city found outside the built-in list is replaced by its zone name (Marseille arrives as Paris, the IANA zone name), and the “Second occurrence” choice isn't included, so whoever opens it sees the first one.
- The grid only offers full hours and a fixed 9:00–18:00 working day for every city, with no weekends, public holidays or country-specific hours taken into account.
- Twelve cities at most per conversion, and the search only offers the most populous cities; for a small town, pick a large city in the same time zone or type the IANA zone name directly.
Privacy
Processed in your browserConversions run entirely in your browser, with no network request. The allin_tools entry in local storage keeps only your starting city and destinations, on this browser alone; dates and times are never written there. The copied link carries the cities, date and time in plain text: anyone who receives it can read them, and the full address reaches the site's server when it is opened. The site's audience measurement strips those parameters and records the page path, the interface language, a mobile-or-desktop flag and a per-tab random identifier, plus one event at your first change and one per link copy, never a city, date or time.
Frequently asked questions
What time is it in London when it's 9:00 AM in New York?
It depends on the date. On August 15, 2026, 9:00 AM in New York is 02:00 PM in London, five hours ahead. On March 15 or October 28, 2026, the same time gives 01:00 PM, because New York is already, or still, on daylight saving time while London is not. That's why the converter asks for a date: the usual five-hour gap only holds for part of the year.
What happens if I pick a time that doesn't exist or happens twice?
A notice appears above the results. For a time skipped when clocks go forward, it states between which times the clocks jump and the time actually used, moved on by the length of the jump. For a time repeated when clocks go back, it asks “Which one?” and offers both, each with its UTC offset; the destination cities update as soon as you choose.
How do I find a meeting slot that works for New York, London and Tokyo?
Add the cities, then look at the “Meeting planner”: each column is a New York hour, and green cells mark each city's working hours. On Wednesday, September 16, 2026, columns 09 to 12 fall between 14 and 17 in London, while no New York working hour lands inside Tokyo's; no hour suits all three. Click the column you settle on to convert it.
Does the person who opens my link see their own time?
Not automatically: the link reopens the same conversion, with your starting city, destinations, date and time. To see their own time, they add their city; with the field empty, the list offers “My time zone” first, based on their own device. They can also move their city to the top and click “Swap” to start from their local time.
Why does the converter remember my cities between visits?
Because it keeps the starting city and destinations you chose in this browser; the date and time start again from the next full hour. On a very first visit, the starting point is your time zone's city if the built-in list knows it, otherwise Paris, and the destinations are New York, Los Angeles and Tokyo, with London replacing your own city if it is one of them. A shared link takes priority over all of this.
Can I convert a past time, such as a time of birth?
Yes, from 1900 to 2100, with the rules that applied on that date. On March 20, 2006, 9:00 AM in New York was 02:00 PM in London; on March 20, 2007, the same time gives 01:00 PM, because US daylight saving time has started three weeks earlier since 2007. For dates before 1970, double-check the result: the database's history is still being corrected.
How do I convert a time given in UTC or GMT?
Type UTC or GMT in “From (city or time zone)”: both lead to the same entry, UTC, which never has daylight saving time. On August 15, 2026, 02:00 PM UTC gives 04:00 PM in Paris, 10:00 AM in New York and 07:00 AM in Los Angeles. You can also enter a full IANA zone name, such as Pacific/Apia, for a zone with no city in the list.