Time Zones · 17 free tools
Time Zone Calculator and Conversion Tools
Time-zone questions are really location questions with an arithmetic layer. Convert a single moment with the time zone converter see the whole world at once on the world time zone map and find the offset at a specific point with UTC offset by coordinates when you have latitude and longitude but no city name.
Offsets are not fixed numbers. They change with daylight saving, and the rules that decide when are political: countries shift them, regions opt out, and some zones are not whole hours from UTC. MapBench resolves offsets from the IANA time-zone database in your browser, which is why the same coordinates can return different offsets in January and July. For anything scheduled or contractual, treat a converted time as a planning aid and confirm the rules with the authority that governs them.
Planning across zones adds the human constraint: 9 to 5 in one place is rarely a civilised hour in another. The meeting time planner and working-hours overlap calculator show the overlap directly. Sun-driven scheduling lives in the sun and moon hub, and coordinate work belongs to the coordinates hub.
Start with these
The three tools that answer the most common question in this cluster. Each page states its method, coverage and limits.
All time zones tools
Every tool in this cluster is linked from this page, so nothing here depends on a search box or a JavaScript menu to be reachable.
Timezone Converter
Convert a time between two places or IANA timezones.
WorldwideWorld Time Zone Map
PopularExplore time zones worldwide with click-anywhere IANA zone lookup, live local time, UTC offset and DST status.
WorldwideMeeting Time Planner
Find overlapping work hours across multiple cities and time zones.
WorldwideTime Zone Converter
PopularConvert a local date and time between any two cities or places worldwide.
WorldwideDaylight Saving Checker
Check whether a place observes daylight saving at a given time.
WorldwideDST Checker by Coordinates
Check whether daylight-saving time is active for coordinates on a selected date.
WorldwideLocal Time by Coordinates
Resolve coordinates to a time zone and show local clock time for a reference instant.
WorldwideLocal Time to Unix Timestamp
Convert a wall-clock date and time in an IANA time zone into Unix seconds.
WorldwideLongitude Time Zone Estimator
Estimate a theoretical 15-degree UTC offset zone from longitude.
WorldwideTime Difference Between Time Zones
Calculate the offset difference between two IANA time zones for a chosen date.
WorldwideTimezone Map Finder
Click the map to see which timezone a place uses.
WorldwideUnix Timestamp to Local Time Converter
Convert a Unix timestamp to a selected IANA time zone.
WorldwideUS Time Zone Map
Click anywhere in the US to see its time zone with a live clock.
US focusedUTC Offset by Coordinates
Find the IANA time zone and UTC offset for latitude/longitude on a selected date.
WorldwideWhat Timezone Am I In?
Resolve a point to its IANA timezone and local time.
WorldwideWorking Hours Overlap Calculator
Find overlapping work hours between two IANA time zones.
WorldwideWorld Clock Map
Compare local times for cities around the world.
WorldwideLearn more about time zones
Guides explain the method behind these numbers, the cases where it misleads, and how to choose between two tools that look interchangeable.
You may also need
These clusters answer the questions that usually follow a time zone tools result.
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About this hub
17 tools are grouped here because they answer the same family of questions. Every result is produced in your browser from the method stated on its own page; for legal, surveying, safety-critical or regulated decisions, verify the answer with the responsible authority.