Two of us run OnlyLeads from London and Tokyo. With a normal working day on both ends there are about two hours a day when we're both at our desks, and the size of that window moves twice a year when the clocks change, on different weekends in different countries. Add a prospect in New York and the window can disappear entirely.
We got tired of doing the arithmetic in our heads, so we built a planner and put it on the site for anyone to use: the timezone planner. No sign-up, no account, nothing to install.
One timeline, every city
Each city gets a strip on a shared hour axis. Working hours are blue, the two hours either side are amber (possible, at a push), and night is dark. A green outline marks the stretch when everyone is working, and a pink line shows where "now" is. Hover or tap any hour to see that moment in every city, then copy it straight into an email.
When there's no shared window at all (London, Tokyo and New York on the same call, for instance) the planner tells you so, and outlines the closest compromise instead of leaving you to hunt for it.
Exact to the minute
India runs on UTC+5:30 and Nepal on UTC+5:45, and most planners quietly round them to the hour. Ours doesn't. London and Mumbai share five and a half working hours, not six, and the overlap stops at 1:30pm London time because that's 6pm in Mumbai. On the timeline, an hour that's half in and half out of someone's day is coloured half and half.
Your working day, not ours
The default is 8am to 6pm, because nine-to-five leaves almost nothing to overlap between Europe and Asia. If your team keeps different hours, change them; the planner remembers them in the link. You can also:
- Type any city, region or abbreviation (Tokyo, Bangalore, PST, CET) instead of scrolling a list of five hundred timezone names.
- Add up to four places, and pick any date from the calendar, so you can check a meeting three weeks out, after the clocks have changed.
- Switch between the 12-hour and 24-hour clock.
- Copy a link to the exact view and send it to whoever you're meeting.
Quick answers for common pairs
For the pairs people search for most there's a page with the gap, how it shifts with daylight saving, an hour-by-hour table and the best meeting window: London to New York, London to Tokyo, PST to GMT, London to Mumbai and a few hundred more.
We build outreach software, and outreach that works ends with two people trying to find a time to talk. This is the part of that we could make free.