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World Time Labv2026.7.5
  • Explore time around EarthWorld Clock

    See the live globe, local clocks, and places around the world.

    • Live World ClockExplore day, night, time zones, and pinned places.
    • Time by CitySearch current local time in cities worldwide.
    • Time by CountrySee every civil time zone used by a country.
    • Distance Between CitiesMeasure great-circle distance on a real globe.
    • Day & Night WidgetAdd the live day and night map to another site.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Convert and coordinateTime Zones

    Translate city times, UTC offsets, and abbreviations without guesswork.

    • Time Zone ConverterCompare cities, PST, WAT, UTC offsets, and more in one view.
    • Meeting Time FinderFind working-hour overlap across as many as six locations.
    • Time Zone Conversion ChartsBrowse quick reference tables for common zone pairs.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Follow the skySun & Moon

    Track sunlight, moon phases, eclipses, and the changing seasons.

    • Sunrise & SunsetFind solar times and day length for any listed city.
    • Moon PhasesSee the live Moon, moonrise, moonset, and phase calendar.
    • Solar & Lunar EclipsesExplore upcoming eclipses and local visibility.
    • Equinoxes & SolsticesUnderstand the tilt, sunlight, and season changes.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Plan dates your wayCalendars & Dates

    Build calendars, count days, and answer practical date questions.

    • 2026 CalendarBrowse the full year with week numbers and holidays.
    • Printable Calendar MakerCustomize columns, colors, logos, holidays, PDF, and ICS.
    • Date CalculatorsAdd dates, count days, find weekdays, and check weeks.
    • Days Between DatesCalculate an exact calendar difference.
    • Add or Subtract a DateMove forward or backward by a duration.
    • Days UntilCreate or browse live event countdowns.
    About & dataAbout World Time LabMethodology & Data SourcesReport an ErrorContact
  • Measure every momentTimers

    Count down, measure laps, or test your reaction speed.

    • Online TimerCount down or up with speed, precision, and optional sound.
    • StopwatchMeasure elapsed time and visual lap splits.
    • Reaction Time TestMeasure keyboard or tap response in milliseconds.
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  • Experiment with a worldPlanet Lab

    Change a planet, inspect the physics, and explore what-if scenarios.

    • Planet SimulatorBuild a world and see computed physical changes.
    • All What-If ScenariosBrowse climate, orbit, impact, and ocean experiments.
    • Snowball EarthFollow ice-albedo feedback across Earth.
    • Runaway GreenhouseExplore an illustrated Venus-like end state.
    • Asteroid ImpactReplay a staged impact, shock ring, and crater.
    • Mega-TsunamiWatch teaching wavefronts cross an ocean.
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Explore World Time Lab

Tools & guides

    • Live World Clock
    • Time by City
    • Time by Country
    • Distance Between Cities
    • Day & Night Widget
    • Time Zone Converter
    • Meeting Time Finder
    • Time Zone Conversion Charts
    • Sunrise & Sunset
    • Moon Phases
    • Solar & Lunar Eclipses
    • Equinoxes & Solstices
    • 2026 Calendar
    • Printable Calendar Maker
    • Date Calculators
    • Days Between Dates
    • Add or Subtract a Date
    • Days Until
    • Online Timer
    • Stopwatch
    • Reaction Time Test
    • Planet Simulator
    • All What-If Scenarios
    • Snowball Earth
    • Runaway Greenhouse
    • Asteroid Impact
    • Mega-Tsunami
About & data
About World Time LabMethodology & Data SourcesReport an ErrorContact
In this sectionAbout & Data
About World Time Lab
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Home/Contact

Contact

World Time Lab is a small independent site. Messages go to one inbox, so a short, specific note gets a useful answer much faster than a general one.

Last reviewed July 21, 2026Site version v2026.7.5

How to get in touch

Emailcontact@worldtimelab.com

Written messages only. World Time Lab has no phone line, no live chat, and no support desk.

The operator of World Time Lab does not run a phone line, a chat widget, or a ticketing system, and World Time Lab has no contact form. That is deliberate: a static site with no form is a site that cannot lose your data.

Three common reasons to write, and where they go

1. Something on the site is wrong

A time that does not match, a missing zone, a region named incorrectly, a holiday on the wrong day, a broken layout. Read Corrections and error reports first. It lists the four things that make a report actionable, page URL, the value shown, the value you expected, and your source, and it also lists the known limits that are not errors, so you do not spend time on a difference that is already documented.

2. A privacy question or request

The privacy policy describes exactly what runs on your device and what leaves it, including every browser storage key the site writes. Most privacy requests are answered by that page: World Time Lab has no accounts, so there is no profile to export or delete. If your question is not answered there, write and say which build you were using and what you want to know.

3. Licensing, attribution, or reuse

If you want to embed, quote, or reuse something, start with Methodology and data sources. Much of what looks like World Time Lab data is third-party open data carrying its own license and its own attribution requirement, and those obligations travel with the data rather than with this site. The terms of use cover what applies to the site's own text, design, and code.

What to expect

  • No guaranteed response time. Mail is read by hand, not by a helpdesk system. Clear reports with a URL and a source are the ones that get acted on first.
  • Not every message gets a reply. Bug reports and corrections usually do. Link exchange offers, guest post pitches, and bulk marketing do not.
  • Fixes ship with the next release. World Time Lab is a static site, so a data correction reaches you when a new build goes out, not instantly. The version in the header tells you which build you are looking at.
  • Your message is not published. Correspondence is not posted, quoted publicly, or used in marketing.

Please do not send

  • Sensitive personal information. Email is not a secure channel, and the operator of World Time Lab does not need your identity documents, financial details, health information, or passwords to answer a question about a clock.
  • Account or deletion requests for accounts that do not exist. World Time Lab has no sign-up, so there is no account to close and no stored profile to erase.
  • Legal, medical, religious, or financial questions. World Time Lab publishes calculations, not advice, and cannot tell you whether a deadline, an observance, or a filing is valid where you live.

Answers that are already written down

  • Which formula, which dataset, how accurate
  • Why my sunrise is a minute off, and what counts as an error
  • What World Time Lab stores in my browser
  • Whether this site sets cookies
  • What World Time Lab is and who maintains it

More about this site

  • About World Time Lab
  • Methodology and data sources
  • Report an error
  • Privacy policy
  • Cookie policy
  • Terms of use
World clock globeTime zone converterMeeting Time FinderTime by countryTime by cityConverter pagesSunrise and sunsetMoon phasesEclipsesSeasonsPlanet LabCalendarPrintable calendar makerDate calculatorsCountdownsTimerStopwatchReaction timeDistanceEmbeddable widget
AboutMethodology & data sourcesReport an errorContactPrivacyCookiesTerms

World Time Lab shows live day and night across the planet. Sun positions are computed with standard NOAA solar equations, and local times come from your browser's own IANA time zone database, so every calculation on this site runs on your device. This build loads no advertising, no analytics, and no third-party scripts at all, and asks for no account. It never asks where you are unless you press "Use my location" on an eclipse page, and that reading stays in your browser. The privacy page explains what that does and does not cover.

© 2026 World Time Lab · v2026.7.5· this build shipped July 24, 2026. Times are shown to the minute and can differ by a minute or two from horizon observations. Time zone boundaries derived from the timezone-boundary-builder project (ODbL); map shapes from Natural Earth; named administrative boundaries from geoBoundaries gbOpen with source years and licenses varying by country. City search data © GeoNames under CC BY 4.0, transformed for prefix search and updated July 2026. Seasons view climate groups derived from the Kottek et al. Koeppen-Geiger world map (2006).