The link is the account: building a no-signup, real-time timezone board
Why timezoners.com has no login, how Supabase realtime keeps a shared board in sync, and the timezone math behind the overlap grid. -
Best overlap: 8:00 AM to 10:00 AM in San Francisco is 4:00 PM to 6:00 PM in Lisbon.
The hours that work for both San Francisco and Lisbon are 8:00 AM to 10:00 AM (San Francisco) and 4:00 PM to 6:00 PM (Lisbon). The shared window is only 2 hours — treat 8:00 AM in San Francisco (4:00 PM in Lisbon) as the one fixed point and plan everything else around it.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
San Francisco America/Los Angeles | ||||||||||||||||||||||||
Lisbon Europe/Lisbon |
Why timezoners.com has no login, how Supabase realtime keeps a shared board in sync, and the timezone math behind the overlap grid. -
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