Meeting planner for time zones
London to Singapore
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 Singapore, hour by hour
Singapore is eight hours ahead of London in the British winter and seven in the British summer. Singapore does not use daylight saving, so the gap changes only when the UK’s clocks do.
With 09:00 to 18:00 on both sides, the overlap is short and falls at the start of London’s day: 09:00 to 11:00 in London in summer, which is 16:00 to 18:00 in Singapore, and a single hour in winter, 09:00 to 10:00 in London and 17:00 to 18:00 in Singapore. A call that runs past 10:00 London in January runs past the end of Singapore’s day.
If an hour is too tight, the usual move is for London to start early: 08:00 in London in winter is 16:00 in Singapore. Click a city to widen its hours and Meridian redraws the window. Kuala Lumpur, Perth, Manila and Shanghai keep the same clock as Singapore.
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.