1View your primary meridian (Prime time) and add cities to track.
2Click "+ Add Meridian" to search for and add new observatories to your collection.
3Switch to Chronos mode to scrub through time and see projected times across all meridians.
4Promote any observatory to Prime Meridian by clicking on its card.
01 · Real-world fits
Common use cases
Coordinating meetings across multiple time zones without miscalculation
Exploring what time it will be in other cities for planned events
Understanding global market hours and when different exchanges are open
Planning international travel and adjusting to jet lag mentally
02 · The honest pitch
Why World Clock?
Instead of juggling calculator apps or tab-hunting for every timezone, the World Clock treats time like an instrument. A 3D globe makes spatial relationships visible, the temporal scrubber lets you explore future moments instantly, and the persistent list of active observatories keeps your most-watched cities one click away.
03 · Edge cases
Frequently asked questions
Click the "+ Add Meridian" button in the sidebar. Search by city name, country, timezone, or coordinates. Click the heart icon to toggle it into your active observatories.
Switch to Chronos mode (second icon in the sidebar). Use the scrubber slider at the bottom to shift time forward or backward in 15-minute increments. Click "Return to Present" to snap back to real-time.
Yes. Click on any observatory card to promote it to the Prime Meridian. It will then appear in the main time display on the left.
The projected date indicator changes automatically. In Chronos mode, cards show "TODAY", "TOMORROW", "YESTERDAY", or "+N DAYS" depending on the scrubbed moment.
Yes. Your list of active observatories and preference settings are saved to your browser's local storage. They persist across sessions and are never sent to a server.
Hover over an observatory card and click the X button to remove it. It will no longer appear in your active observatories.