Time Zone Meeting Planner
Add the cities you work with, and see at a glance which hours land inside everyone's working day.
Picked time
How it works
Add places by city name (Tokyo, São Paulo) or by IANA time zone name (America/Chicago). The first row is your home zone: the grid shows its day hour by hour and lines every other city up underneath. Green cells are inside the working hours you set, amber cells are early morning or evening, grey is night, and a small +1 means it is already the next day there.
Hours with a teal underline are inside working hours for everyone for the whole meeting length, and the summary line lists them. When no hour fits, it suggests the hour that suits the most people without waking anyone in the middle of the night. Click any cell (or use the arrow keys and Enter) to pick that hour, and the panel below shows the start and end in every city.
Offsets are worked out by your browser's own time zone database for the exact date you choose, so daylight saving is always right, including places with half-hour or 45-minute offsets such as India and Nepal. If a city changes its clocks within two weeks of your date, you get a warning, because a recurring meeting will move for some people that week.
Copy for an invite gives a plain list of the time in each city plus UTC. Download .ics makes a calendar file that any calendar app can import, stored in UTC so it shows correctly for every attendee. The address bar keeps your cities, date and time, so Copy share link lets colleagues open exactly the same view.
Questions
Does this know about daylight saving time?
Yes. It uses the time zone rules built into your browser for the chosen date, the same data your operating system's clock uses, and it warns you when a change is coming up.
Why are some cities shown under a different name?
Time zones are named after one major city. Bangalore uses Asia/Kolkata and Boston uses America/New_York, for example. You can type either, and the label keeps the name you typed.
Is GMT the same as UTC?
For scheduling, yes: both mean zero offset. The UK uses GMT only in winter and switches to BST (UTC+1) in summer, which is why Europe/London is safer than "GMT" for a recurring meeting.
Is anything stored or sent?
No. The planner runs in your browser and nothing is saved on a server. Your list lives only in the page address, so it is gone when you close the tab unless you keep the link.
How do I measure how far apart two moments are?
Use the free <a href="/date-difference">date difference calculator</a> for age, duration and ISO weeks in your browser, or Anvil's <a href="https://api.oddlathe.com/docs/date-diff">date difference API</a> from a script. This planner is for picking a meeting time across cities.