Find the common time slot
Add 3 or 4 cities. The timeline below colors every hour — sleep, meals, available — and highlights in green the window where everyone is awake and free.
24-hour timeline (UTC)
Hover a column to see each city's local time.
Best common time slots
Understanding the categories
Window where the person is awake and considered reachable for work or a meeting — outside sleep and lunch.
Time set aside for lunch. The person is awake but usually unavailable for a scheduled meeting.
Early mornings and evenings: the person is likely awake but outside their usual working hours. Use for exceptions, not as a default.
Window where the person is most likely asleep. Avoid reaching out here except for a genuine emergency.
How it works
Choose 2 to 4 cities you need to coordinate meetings or work with.
Every hour of the day is color-coded — sleep, meals, available — for each city.
The slot highlighted in green is when every city is available at the same time.
Adjust sleep, meal and availability hours to match your team's real habits.
Frequently asked questions
How is the common time slot calculated?
The tool converts the current time into each selected time zone, then classifies every hour of the day as sleep, meal, available, or off-hours. The common slot is the set of hours where every city is available at the same time.
Does the tool account for daylight saving time?
Yes. Calculations use IANA time zone identifiers (for example Europe/Paris or America/New_York), which automatically apply each country's own daylight saving rules.
Can I customize my sleep and work hours?
Yes. In the “Customize the hours” section, you can adjust sleep, morning availability, lunch break, and afternoon availability. These settings apply in local time, the same way for every city you add.
How many cities can I compare at once?
You can compare between 2 and 4 cities at a time.
Is my data saved or shared?
No. All calculations run directly in your browser — no city or setting is sent to a server. The contact form is the only exception, and only if you choose to use it.
Is the tool free?
Yes, the tool is completely free and requires no sign-up.
What happens if there's no common slot?
If the cities you added have no overlapping available hours under the current settings, the tool lets you know and suggests removing a city or widening your custom hours.
Customize the hours
These windows apply in local time, the same way for every city. Adjust the hours to match your habits.
Contact us
A suggestion, an idea for improvement, or interested in advertising on the site? Write to us.
