Time-zone converter and meeting planner
To plan a meeting across time zones, fix the single moment you want, then read it in each attendee's zone. This tool takes one date and time in a source zone, converts it to an absolute instant, and shows that instant in every city you pick, flagging whether it lands in normal working hours of 9am to 6pm locally. Daylight saving is handled automatically because each zone's own rules are applied for the date you choose, so a London-to-New-York meeting reads correctly whether or not the clocks have changed.
Enter the time and the zone it is in, then pick the cities you want to see it in. Hold Ctrl or Cmd to choose several. The working-hours flag gives a quick read on whether the slot suits everyone.
How this is worked out
The tool fixes the single moment you enter, then re-displays that same instant in each chosen zone using your browser's built-in time-zone database.
your time + source zone = one absolute moment (UTC)
that moment is then formatted in each target zone
daylight saving is handled automatically because each zone's rules are applied for that date
A green flag means the converted time falls between 09:00 and 18:00 local, a reasonable working-hours window for a meeting. Zone rules come from the IANA time-zone database shipped with your browser. Always confirm with attendees, since some regions change their clock-change rules.
Planning around UK days off too? See the 2026 UK bank holidays or the full calculator set.
Zone rules come from the IANA time-zone database in your browser. Confirm with attendees, as some regions change their clock-change rules.
Calculators and Data Desk, Dates & Times
Dates & Times's editorial desk builds and documents the calculators, citing the underlying date maths and the official UK source behind every number. Calendar and time tools are checked against primary UK sources such as the gov.uk Bank Holidays API before publication.
Last reviewed: 12 June 2026