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. -
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. To edit hours, add more timezones, and share with your team, create a free collaborative board.
| UTC (GMT+0) | 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 | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | Previous Day 11pm | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm |
Lisbon Europe/Lisbon | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm | Next Day 12am |
Why timezoners.com has no login, how Supabase realtime keeps a shared board in sync, and the timezone math behind the overlap grid. -
Is your distributed team burning out? The culprit might not be the workload-it might be the clock. Here's how to spot Time Zone Fatigue and fix it. -
The Philippines sits 12 to 16 hours ahead of the US and never changes its clocks. Exact overlap windows for every US coast, the tomorrow problem, and a rotation rule that works for product and BPO teams. -