Cookie Policy
This page is written from the configuration of the build you are reading, so it describes what actually runs rather than what a site of this kind usually does.
Last reviewed July 21, 2026Site version v2026.7.5No cookies set by this build
What this build does
This build sets no cookies at all. Not a first-party cookie, not a third-party cookie, not a session cookie. There is no advertising script, no analytics script, and no embedded third-party content, so nothing is present that could set one.
World Time Lab does keep a small number of preferences in your browser's local storage. Local storage is not a cookie: it is never attached to a network request, so it does not travel to the host or to anyone else. Those keys are listed below in full.
You can verify any of this yourself. Open your browser's developer tools, choose the Application or Storage panel, and look at the Cookies and Local Storage entries for this domain. Nothing on this page depends on you taking our word for it.
Preferences World Time Lab stores
These are the keys this build writes or reads. Each one is created only when you use the feature that needs it, each exists so the interface behaves the way you left it, and none of them identifies you. They all carry the sd- prefix, so the storage panel in your developer tools will show you the current set directly.
| Name | Type | Set by | Lasts | Purpose |
|---|---|---|---|---|
sd-theme | Local storage | This site | Until you clear site data | Remembers whether you chose the light or the dark theme. |
sd-pinned-places-v2 | Local storage | This site | Until you clear site data | Remembers the places you pinned in the world clock workspace. |
sd-pinned-places-v1 | Local storage | This site | Until you clear site data | An older pin list. Read once so old pins survive an upgrade; never written. |
sd-calendar-maker-project | Local storage | This site | Until you clear site data | Your draft in the printable calendar maker, so a reload does not lose the work. |
sd-timer-presets-v1 | Local storage | This site | Until you clear site data | Timer presets you chose to save. |
sd-reaction-history-v1 | Local storage | This site | Until you clear site data | Your own recent times and best score in the reaction-time test. |
sd-hour-cycle-v1 | Local storage | This site | Until you clear site data, or until you switch back to following your browser | Remembers whether you chose the 12-hour or the 24-hour clock, so every page agrees with you. |
sd-eclipse-place | Local storage | This site | Until you clear site data | The one place you last chose in the eclipse tool: label, coordinates and time zone. Written when you search for a place, type coordinates, or press Use my location. It stays in this browser and is never put in the address bar. |
Refusing them costs you very little: the theme falls back to your operating system preference, the clock format falls back to your browser's, and pinned places, saved presets and your last eclipse place last only until you close the tab. No feature is locked behind storage.
Advertising and analytics cookies
None are present in this build. World Time Lab can be built with Google AdSense or Google Analytics enabled, but both are switched on only by supplying credentials at build time. Neither was supplied for the build you are reading, so no such script is on the page and no advertising or analytics cookie exists to describe.
If that changes, this page changes with it: the categories below are filled in from the build configuration rather than written in advance. For background on what those cookies would do, Google documents them in its advertising cookie documentation and its general cookie documentation.
Consent and how to change your mind
There is no consent prompt on this build because there is nothing to consent to: no cookies are set and no third-party script runs. A prompt that asks permission to do nothing would be theater, so World Time Lab does not show one.
Browser controls that always work
- Clear site data for this domain in your browser settings removes every key in the table above.
- Block cookiesfor this site, or block third-party cookies globally. World Time Lab's own tools do not need cookies to work.
- Private or incognito windows discard everything when the window closes.
- Content blockers stop third-party scripts before they load, in any build.
Related pages
The privacy policy covers the wider picture, including what the host can see and which data files the site fetches while you use it. The terms of use cover what the site is and is not warranted for.
Questions about storage or cookies on a specific page. Please include the page URL.