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About

Time Zone Converter

Pick a time in one city and read it in every other, with the day beside it, because the hour is the easy part and the date is what gets somebody on a call the morning after. Under it, an hour grid with everybody’s working hours shaded, and a warning when the gap between two cities changes before the meeting.

What it does

  • One time in every city, the date beside each, in 12 or 24 hour form.
  • An hour grid for the whole day, working hours shaded, and each hour showing how many of the cities are at work.
  • The day a gap changes, named: Istanbul and New York are seven hours apart in October and eight from early November.
  • An hour that never happens, or happens twice, on the nights the clocks move, said out loud instead of silently picked.
  • The meeting as a calendar file with the time in UTC, so each guest’s calendar shows it in their own zone.
  • 112 cities searched by what people call them: Turkey finds Istanbul, UK finds London, Bangalore finds Kolkata.
  • Zones read from your browser’s own copy of the IANA database, and the whole conversion copied as text.

How to use it

  1. Add the cities.
  2. Set the time in one of them; the rest follow, with their dates.
  3. Read the grid for a slot inside everyone’s working hours.
  4. Download the calendar file and send it.

What it does not do

  • A link to share: the address carries the window, not its state, so the calendar file and the copied text are what you hand over.
  • A clock that ticks: it would redraw the grid every second for a question nobody asked.
  • Sunrise and sunset, and offsets before 1970: the database keeps those as local mean time, and no meeting was ever set in them.

Questions

Why is 15:00 in London a different day in Sydney?

Because it is: the date changes with the hour, and each row shows the day for exactly that reason.

What is a gap change?

Two places that both move their clocks, but on different dates (Europe in late March and late October, the US in mid March and early November), are a different number of hours apart for a few weeks a year. A meeting set by local time drifts, and the tool names the day.

Why can’t I enter 02:30 on the night the clocks go forward?

Because in that zone 02:30 never happens that night; the tool says so and shows what it read instead. On the autumn night an hour happens twice, and both are named.

How current are the zones?

As current as your browser: the tool reads the browser’s own copy of the tz database. A rule change announced for next year appears when the browser updates, so a far-future answer for a zone that has just changed its rules can lag until then.

Everything here runs in your browser. Nothing you type, paste or open is uploaded, and there is no account and no queue. How that works.

For one job

  • Meeting Planner: The hour that suits every city best, and a calendar file to send.

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