World clock generator

Plan one time, see every city.

Use a reference time in any supported IANA time zone, then generate a clean comparison board for global meetings, travel handoffs, launch windows, or distributed support schedules.

12 popular cities ready to add
DST-aware detects invalid local times during offset jumps
Copy-ready exports a shareable summary in plain text

What this page solves

Time zone math breaks down when offsets change, midnight crossings matter, or a local time does not exist because of daylight saving transitions. This generator converts the exact instant first, then formats every selected city from that same moment.

Rounding is not applied to times. The tool uses minute precision from your input and reports day changes relative to the reference zone.

Generate a world time board

Pick the reference date and time, choose the source time zone, add cities, then generate the comparison table and shareable text block.

This value is interpreted in the reference time zone, not your device time zone.
Choose the zone that the input date and time belong to.
Duplicate cities are ignored automatically.

Selected cities

Reference instant

Reference zone

Generate a board to see the formatted reference time.

UTC anchor

The UTC equivalent appears here after generation.

Planning note: always confirm final meeting times with participants near daylight saving changes, public holiday schedules, or government-announced time zone rule changes.

City comparison

City Local time Offset Day relation Time zone
No board generated yet.

Shareable summary

Copy this block into chat, email, or release notes. The export keeps minute precision and lists cities in the current board order.

How it works

This generator treats your input as a local clock reading in the reference time zone, converts it into one exact instant, and then formats that same instant in every selected city. That matters because offsets differ and can change seasonally.

If a local time is invalid because the zone jumps forward for daylight saving time, the page shows an inline error instead of guessing. If a city lands on a different calendar day from the reference zone, the table labels it as previous day, next day, or a larger day shift when needed.

Supported zones use standard browser time zone data through the Intl API. Results are only as current as the visitor’s browser time zone database.