Time zone converter and meeting planner
Add every city your team lives in and see the whole day at a glance. Changetz highlights the hours when everyone is awake and working, so you can pick a slot without doing mental arithmetic.
Best time to meet
Hours highlighted in green work for everyone on the list.
- San Francisco 8aNew York 11a · London 4p
- San Francisco 9aNew York 12p · London 5p
How it works
Add your cities
Search by city, country or time zone. Your list is saved on this device.
Read the whole day at once
Every row is one city, aligned so that a column is the same instant everywhere. Colours show who is asleep.
Take the green slot
We score every hour against everyone’s working day and mark the winners. Share the link and everyone sees the same plan.
Popular conversions
The time zone pairs people look up most.
- New York → London
- London → New York
- New York → Los Angeles
- Los Angeles → New York
- New York → Tokyo
- London → Tokyo
- San Francisco → London
- New York → Chicago
- London → Paris
- London → Sydney
- New York → New Delhi
- San Francisco → New Delhi
- New York → Singapore
- London → Dubai
- Chicago → London
- New York → Berlin
- Toronto → London
- New York → São Paulo
- London → Singapore
- Los Angeles → Tokyo
Time in major cities
- New York, United States
- London, United Kingdom
- Los Angeles, United States
- Tokyo, Japan
- Paris, France
- Madrid, Spain
- Chicago, United States
- Berlin, Germany
- Sydney, Australia
- Singapore, Singapore
- Hong Kong, Hong Kong
- Dubai, United Arab Emirates
- Mumbai, India
- Shanghai, China
- Toronto, Canada
- San Francisco, United States
- Mexico City, Mexico
- São Paulo, Brazil
- Buenos Aires, Argentina
- Moscow, Russia
- Istanbul, Turkey
- Seoul, South Korea
- Amsterdam, Netherlands
- Beijing, China
- Rome, Italy
- Barcelona, Spain
- Zurich, Switzerland
- Dublin, Ireland
- Lisbon, Portugal
- Stockholm, Sweden
- Vienna, Austria
- Brussels, Belgium
- Munich, Germany
- Frankfurt, Germany
- Milan, Italy
- Warsaw, Poland
- Prague, Czechia
- Athens, Greece
- Copenhagen, Denmark
- Oslo, Norway
- Helsinki, Finland
- Bogotá, Colombia
- Lima, Peru
- Santiago, Chile
- New Delhi, India
- Bangalore, India
- Jakarta, Indonesia
- Bangkok, Thailand
Frequently asked questions
Is it free?
Yes. Changetz is free to use and does not require an account. It is paid for by the ads on the page.
How many cities can I add?
As many as you like. The grid scrolls sideways, and the recommendation always takes every city on the list into account.
How does it decide the best time?
Every hour is scored against each city’s working day: 9:00–17:00 scores best, 8:00 and 17:00 are acceptable, and 7:00, 18:00 and 19:00 are a stretch. The slot with the best worst-case across all your cities wins, because a meeting is only as good as it is for the person it suits least.
Is my list of cities sent anywhere?
No. It is kept in your browser and in the link you share. There is no account and no server storing it.