Utility Empire · dates

Multi-City World Clock

Add city cards by UTC offset and watch every local clock tick live, side by side. All times are computed purely in your browser from the current UTC time — no network, no external time APIs.
TICK
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UTC NOW
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OFFSET
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CITIES
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FORMAT
OFF

Tick detector

The clock loop is alive and re-rendering every second. A healthy tick means every city card is staying in sync with the device clock.

UTC now

The single source of truth. Every city time is the current UTC instant shifted by that city's fixed offset — never corrected for DST.

Offset detector

Validates every mounted offset (integer or half-hour, plus any custom minute offset) against the −12:00 to +14:00 legal range.

Cities detector

The cards currently mounted on the grid. Add presets or custom offsets to grow the comparison board.

Format detector

Clock display mode. 24-hour keeps a plain HH:MM:SS; 12-hour adds AM/PM with tabular-numeral alignment.

UTC reference — now

UTC+0 · Greenwich
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Add a city

Pick a preset offset or enter a custom one (e.g. −5, +5.5, 5:30). Your city list is remembered on this device.
DST is not auto-applied. Offsets are fixed and chosen manually, consistent with the Time Zone Difference Calculator — adjust a card when a region enters or leaves daylight saving time.

City clocks

0 cities
No cities yet Add your first city from the preset picker — Los Angeles, New York, London, Tokyo and more are one click away.
Utility Empire · world-clock · pure client-side · no data leaves your browser