Timezone Converter — Compare Times Across Cities

Compare times across cities with a visual timezone grid

Work hours (9-5)Off hoursNight
My Time
UTC+0Fri, Apr 17
New York
UTC-4Fri, Apr 17
London
UTC+1Fri, Apr 17
Tokyo
UTC+9Fri, Apr 17
My Time
11:06 AM
New York
7:06 AM
London
12:06 PM
Tokyo
8:06 PM

How to use

  • Click any hour block to set that as the reference time across all zones
  • Use the arrow buttons to shift by one hour, or pick a specific date
  • Green blocks = working hours (9 AM - 5 PM), dark blocks = nighttime
  • Hover over a column to see the same moment highlighted across all timezones
  • Toggle between 12-hour and 24-hour format with the 12H/24H button

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FAQ

Frequently Asked Questions

How does the timezone converter work?
The tool uses the Intl API built into your browser to calculate accurate timezone offsets. It displays a 24-hour grid for each selected city, so you can visually compare what time it is everywhere at a glance. Click any hour to set it as the reference time.
How do I find the best meeting time across timezones?
Add all the cities your team is in, then look for columns where the green (working hours) blocks overlap. Those are the hours when everyone is within their 9 AM to 5 PM window. You can click any hour to see the exact time in each city.
Does the converter account for daylight saving time?
Yes. The tool uses the IANA timezone database via your browser, which automatically handles DST transitions. The offsets shown are always accurate for the currently selected date.
What do the colors in the time grid mean?
Green blocks indicate working hours (9 AM to 5 PM). Dark/gray blocks indicate nighttime (10 PM to 6 AM). White blocks are off-hours but still daytime. The indigo highlight shows the current time.
Can I share my timezone comparison?
The tool runs entirely in your browser and does not require a server. You can bookmark this page and your selected cities will be ready to re-add when you return. For quick sharing, take a screenshot of the time grid.