Time zone planner. Find the hour that works for everyone.
Calculated locally with your browser's own time-zone database, nothing is sent anywhere.
Find the meeting slot that works for everyone
Pick a reference city, drag the slider, and every other zone updates live, green blocks show the standard 9-to-6 working hours, striped blocks mark the hours people are likely asleep, and the banner under your cities tells you whether the selected hour lands inside everyone's workday. When it doesn't, the planner scans the whole day in 30-minute steps and hands you the longest window where all zones are at work. It uses your browser's built-in time-zone data, so daylight saving is handled automatically, and your city list is remembered between visits without an account.
How to use the Time Zone Planner
This planner shows the local time in several cities at once and helps you find a meeting time inside everyone's working day. You set a time in one reference city, and every other city follows, using your browser's own time zone data, so daylight saving is handled for the date you are looking at. It is for anyone booking calls across countries.
Step by step
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Check the starter list
On your first visit the planner adds your own time zone plus New York and London, with your zone as the reference. Browsers that name India's zone Kolkata also add it; Chrome and Edge call it Calcutta and leave it out. Remove any city you do not need with the × button at the right of its card.
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Add the cities you need
Pick a zone in Add a time zone and press Add. The list holds every time zone your browser knows, shown as city and region, for example Los Angeles, America. A zone that is already on your list is not added twice.
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Choose the reference zone
In Reference zone, pick the city you want to set the time in, usually your own or the host's. The list only offers cities you have added. The reference city's card carries a Reference badge.
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Drag the time slider
Move the Reference time slider across the day in 15 minute steps, from 12a to 12a. The label next to it shows the time and city, and every card updates as you drag. You can also focus the slider and use the arrow keys.
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Read the overlap banner
With two or more cities, a banner under the cards tells you whether the selected time falls inside everyone's working day. Press Reset to now to jump back to the current time.
Reading the result
- Each card shows the city, its region, its offset from UTC such as UTC+5:30, the short zone name where the browser has one, and the local time at the moment you selected.
- Under the time, same day means the city is on the same calendar date as the reference city; +1 day (next day) means it is already past midnight there, and -1 day (previous day) means it is still the day before.
- In the 24 hour bar, green blocks are working hours from 9am to 6pm, striped blocks are 11pm to 7am when people are likely asleep, and the outlined block is the selected hour in that city.
- If the selected hour works for everyone the banner says Good time to meet. If not, it shows the longest shared working window in the reference city's time, checked in 30 minute steps. New York and London usually share about four hours.
- If there is no hour when every city is at work, the banner says so. Add India's zone (listed as Kolkata or Calcutta, Asia) to New York and London and that is what you see, so someone will need an early or late call.
Tips and common mistakes
- Set the reference zone to the person with the least flexible day, then slide until their time looks reasonable and check the others.
- Working hours are fixed at 9am to 6pm in every city and weekends are not taken into account. Check that the day is a workday for everyone.
- The overlap check works by whole hours, so in zones with a 30 minute offset, such as India, 8:30am does not count as working time but 5:45pm does.
- Changing the reference zone keeps the same moment in time and moves the slider to that city's local time, so you can switch views without losing your spot.
Privacy and limits
All times are worked out in your browser from its built-in time zone database. Nothing is sent anywhere. Your list of cities and your reference zone are saved in this browser's local storage so they come back on your next visit; clearing site data removes them. The slider position is not saved.
Everything a planner should do.
- Compare any combination of time zones side by side, every IANA zone your browser knows is in the picker.
- Drag a 24-hour slider in 15-minute steps and instantly see what hour it is in every added city.
- Spot working-hour overlap at a glance: green blocks mark the 9am, 6pm window, striped blocks the likely-asleep hours. Our agile offshore software development page explains how a Delhi and New York team works across that gap.
- Get the best meeting slot automatically, the banner shows the longest window where every zone is inside its workday.
- See day-boundary shifts so you know when a zone has already crossed into the next or previous calendar day.
- Keep your city list between visits: zones and your reference city are saved locally in the browser, no account needed.
Frequently asked questions.
Is the Time Zone Planner free?
Is it private? Is my data uploaded anywhere?
Does it handle daylight saving time?
What do the green and striped blocks mean?
Will my city list be saved if I close the tab?
How is the best meeting window calculated?
Published · Last updated .
