Local calculation and site data
The site has no calculation backend or accounts. Its data boundaries are:
- Calculation: Inputs and results are processed on your device without a calculation API. This does not prevent third-party services from processing page data.
- Accounts: No registration, passwords or user profiles are required.
- Contact: If you email us, we receive the address and information you choose to send.
- Page delivery: Cloudflare delivers the site and can process request information such as IP addresses and requested URLs.
Third-party analytics and advertising are separate from calculation. Do not enter sensitive information or encode it in a shared link.
How the calculators work
Every calculator on TimeDateLab runs in your browser. Here's the process:
- Your browser downloads the page, its styles and its scripts.
- You enter times or dates into the calculator.
- The calculation runs in your browser, on your device.
- The result appears on the page.
- Reset clears the current calculation; Time Card keeps an Undo reset snapshot temporarily in tab memory. Shared links and third-party records are not erased.
The Now and Today buttons read your device's clock only when you click them. A calculation is written into a link only when you choose Share. The part after # is not sent in ordinary HTTP requests, but page scripts can read it and include it in third-party requests. Shared links may remain in history, sync, the clipboard and recipients’ devices after Reset or closing a tab.
Cookies and tracking
Preferences: We save your 12-hour or 24-hour display choice in your browser so times appear the way you like.
Analytics: The analytics and advertising services we use set their own cookies; see Third-party services below.
Saved in this browser
Time display
12-hour or 24-hour
Third-party services
We show ads through Google AdSense. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the Internet.
You can opt out of personalized advertising in Google Ads Settings.
We use Google Analytics 4 to measure visits and site usage. It uses cookies and processes page addresses, browser and device information, and usage events.
We use Microsoft Clarity for behavioral metrics, heatmaps and session replay to improve usability. It uses cookies and other tracking technologies to process interactions and page content, which may include displayed results.
Analytics and advertising scripts can process page URLs, including shared inputs in fragments. TimeDateLab’s own usage events record fixed tool, mode, error and action-status categories, not calculator inputs or results; that does not limit what vendor scripts process. Clearing the time-display preference does not delete vendor cookies or records.
For internal tool navigation, we use session storage to carry fixed tool, mode, language and link-position categories, not inputs, results, URLs or user identifiers. We use each record at most once, ignore it after 30 seconds, and clear it when read or when the tab closes. Clearing the time-display preference does not clear this analytics session record.
How Google uses data from partner sites · Microsoft Privacy Statement · Cloudflare Privacy Policy
Contact us
TimeDateLab is operated by TimeDateLab Team. If you have questions about this policy, email us at: