Local · Private · Free

Time Zone Planner

Add cities, drag the slider across the day, and instantly see everyone's local time. Overlapping working hours are highlighted in green so you know exactly when to schedule the meeting.

Add a time zone

Reference zone (set the time in…)

Reference time, ,

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Working hours (9am, 6pm) Likely asleep Selected hour

Calculated locally with your browser's own time-zone database, nothing is sent anywhere.

No zones yet, add a city above to start planning.

Find the meeting slot that works for everyone

Pick a reference city, drag the slider, and every other zone updates live, green blocks show standard 9-to-6 working hours and the banner tells you whether the selected hour lands inside everyone's workday. It uses your browser's built-in time-zone data (so daylight-saving is handled automatically) and runs fully offline.

About Time Zone Planner

Time Zone Planner is a free, private tool by Digital Heroes that runs entirely in your web browser. Add any number of cities, drag a time slider, and instantly see the local time in every zone. Green blocks highlight the standard 9am to 6pm working window, and an overlap banner tells you the best shared meeting slot automatically. Because all calculations happen in your browser, nothing is uploaded to a server, no sign-up is needed, and the tool works offline. It handles daylight saving automatically using your browser's built-in time-zone data.

What you can do

Compare any combination of time zones side by side in a single view.

Drag a time slider to instantly see what hour it is in every added city.

Spot working-hour overlap at a glance: green blocks show the 9am to 6pm window for each zone.

Find the best meeting slot automatically: the overlap banner shows the longest shared workday window.

See day-boundary shifts so you know when a timezone crosses into the next or previous calendar day.

Save your zone list between sessions: your cities are stored locally in the browser with no account needed.

How to use Time Zone Planner

Open Time Zone Planner in your browser. No signup or install required.

Use the Add a time zone dropdown to add each city or region you need to compare.

Choose a reference city from the second dropdown, then drag the time slider to any hour of the day.

Read each card to see the local time and day in every zone. Green slots show 9am to 6pm working hours.

Check the overlap banner at the bottom: it tells you whether the selected hour is inside everyone's workday, and shows the best common window if it is not.

Frequently asked questions

Is Time Zone Planner free?

Yes, Time Zone Planner is completely free for everyone. No sign-up, no account and no usage limits.

Is it private? Are my files uploaded anywhere?

No. Time Zone Planner runs entirely in your browser on your own device, so your data never leaves your computer and nothing is uploaded to a server.

Does it work offline?

Yes. This tool is a Progressive Web App, once the page has loaded it keeps working offline, and you can install it as an app from your browser.

Do I need to install anything or create an account?

No. Just open the page and start using it. Installing it as an app is optional and only adds offline convenience.

What does Time Zone Planner do?

It lets you add multiple cities, drag a slider across the 24-hour day, and see the local time in each zone instantly. Working hours are highlighted in green, and the tool shows the longest shared working window so you can book a meeting time that works for everyone.