Time Zone Planner

Compare cities, see work-hour overlaps, pick a meeting time that works for everyone.

Meeting time: —

Drag the slider to find a time when every card's strip is in the green work-hour band. Cities save automatically — only on this device.

What is this time zone planner?

This free tool tracks the current time in multiple cities side by side, highlights each city's work hours on a 24-hour timeline and lets you drag a meeting-time slider to find an instant that lands inside business hours for every selected city — DST-aware and entirely client-side.

What's a good time to schedule a meeting with people in different time zones?

Add each city, then drag the meeting-time slider until every card's timeline shows a marker inside the green work-hour band — that instant is within 09:00–18:00 local time everywhere.

Key features

Live ticking clocks
Each city updates automatically — Daylight Saving Time, regional offsets and DST transitions are applied via the browser's IANA timezone database.
Work-hour overlap
Every card draws a 24-hour timeline with a green 09:00–18:00 band, an amber now marker and a white meeting marker so overlaps are obvious.
Meeting-time slider
Drag a slider to project a single instant into every selected city and see which ones are at work, in the evening or in the middle of the night.
Cities saved locally
Your chosen city list lives in localStorage on this device only — no sign-in, no upload, no sync.

How to use it

Type a city name in the search box and pick a result to add it. Re-order or remove cards with the arrow and × buttons. To plan a meeting, drag the slider until every card's strip is in the green band, then read the wall-clock time on each card.

Frequently asked questions

Does the planner handle Daylight Saving Time?

Yes. Each city uses its IANA timezone via the browser's Intl API, so DST transitions are applied automatically and on the correct local date.

Is my saved list of cities shared anywhere?

No. Your cities live in localStorage on this device only — nothing leaves the browser.

How do I find a good meeting time across all cities?

Drag the meeting-time slider. Each city's timeline highlights its work hours; green segments overlap means everyone is in their workday. Pick a slider position where every city is green.

My city isn't in the list — can I still add it?

The search matches IANA zones too, so typing a region name like Europe/Paris or America/Sao_Paulo works even when the city label isn't preset.

Time-zone calculations use the browser's native Intl.DateTimeFormat and the IANA tz database that ships with every modern browser, so DST rules, leap-year handling and historical zone changes are handled by the same code that operating systems use.