Meeting planner for time zones
London to Sydney
Add up to six cities and move the sun. The light on the planet is real, so daylight saving is already accounted for - and the page says who is at their desk rather than leaving you to count backwards on your fingers.
You move the sun. The world answers.
The globe is not a picture of a globe. The terminator is where the sun actually is at that moment on that date, computed on your own device, so a clock change in one city is a fact of the image rather than a footnote under it. Move the sun or the timeline and every city re-reads - local time, working hours, and whether the whole meeting fits.
Add your cities
Up to six. Set each person's working hours once; Meridian handles the offsets, the daylight saving and the weekend - which is theirs, not ours.
Choose the window
Pick a date and how long the meeting is. The answer accounts for the whole meeting, not just the moment it starts, so a call that would overrun someone's day is not offered as one that fits.
Send it
Copy every local time in one line, add it to your calendar, or share the link - which carries the date, the cities, the time and the length, so they see exactly what you see.
Meridian
London to Sydney, hour by hour
Sydney is ahead of London by between nine and eleven hours, because the two cities change their clocks in opposite directions. Sydney’s daylight saving runs from the first Sunday in October to the first Sunday in April, and the UK’s from the last Sunday in March to the last Sunday in October. In the British winter the gap is eleven hours, in the British summer nine, and for a few weeks around each change it is ten.
With 09:00 to 18:00 on both sides there is no time when both are at their desks. In the British summer, 09:00 in London is 18:00 in Sydney, so the two working days meet end to end. In January, 09:00 in London is already 20:00 in Sydney.
The usual answer is a London evening and a Sydney morning the next day: 21:00 on a Monday in London in January is 08:00 on Tuesday in Sydney. Friday evening in London is already Saturday in Sydney, and Meridian counts that as out of hours.
Questions
Does it handle daylight saving?
Yes. Every time on the page comes from your browser's timezone database, which knows when each city changes. If your call crosses a change, the gap moves and the page shows the new time.
Can I set different working hours for each city?
Yes. Click a city card to edit its hours. Weekends count as out of hours, so the page will tell you nobody is at their desk on a Saturday rather than pretending otherwise.
What if there is no time that works for everyone?
Meridian shows the best fit it can find and names who would be outside hours, rather than pretending it works. The ring is dashed rather than solid when that happens, so a partial answer never looks like a whole one. Widen someone's hours or drop a city and try again.
Can I put Meridian on my own site?
Yes. Choose Embed, copy the snippet, paste it into any page. It carries a small “Built by Digitopia Labs” line, which is the price of it being free.