SIMPLE BY DESIGN
Your time stays
in your browser.
No account. No uploaded calendar. No advertising scripts.
What this tool does
All date and time calculations happen on your device. We do not send conversion inputs to a calculation API, store them in a database, or use cookies. Copy buttons access your clipboard only when you click them.
Sharing a result
A share link contains the conversion settings after the # character. This URL fragment is not part of the HTTP request sent to the host, but it is visible to anyone you give the link to and may be saved in browser history. Only share times you are comfortable disclosing.
Hosting and network data
Cloudflare serves this website and may process normal connection and request information, such as IP addresses, for delivery and security. This is separate from the conversion itself. See Cloudflare’s privacy policy.
Referral diagnostics
The site can recognize a supported referring hostname or an explicit referral tag, such as utm_source=chatgpt. It stores only the source label, evidence type and successful “Convert time” submission count for this tab’s session in session storage. No dates, converted times, full referring URLs or unique visitor IDs are stored. No analytics request is sent. Tagged links describe a claim about the source, not proof of an AI recommendation.
Automatic previews are not counted. This diagnostic is local to your browser; it is not a site-wide traffic report. It works even if no referral information is available, and conversion still works when browser storage is blocked.
View this session’s referral diagnostic
JavaScript is required to display local session information.
Advertising and future changes
Advertising is currently disabled. There are no third-party advertising tags or publisher IDs. This page will be updated before additional measurement or advertising is introduced.