PRIVACY
The calendar arithmetic stays here.
Monthstep does not send your entered source date or month offset to a calculation service.
Inputs and result notes
No account, calendar connection or file upload is needed. This release does not store calculator history in cookies, local storage or session storage. Reloading restores the fixed example, not the current date. Inputs have no form names and remain disabled until the app starts, so a no-JavaScript form submission cannot put them in a URL query.
Save text and Save JSON create a local file from the current valid result. Notes contain the source, offset, policy, date and model assumptions; they are not uploaded by the site. Invalid or rejected results disable these actions and clear the old payload.
Clipboard
The clipboard API is used only when you press Copy notes. Your browser may deny access; a selectable copy field then appears. A write already handed to the browser cannot be cancelled by editing the inputs. Messages and fallback text from an older result are suppressed.
Hosting and external services
The host may process ordinary requests, IP addresses and technical information to deliver and protect the site. This calculator source contains no active advertising, analytics or consent-platform script. Publisher metadata and ads.txt prepare possible future advertising; they do not activate ads. This notice must change if tracking is enabled.
Reference links open external sites with their own practices. Email is handled by email and forwarding providers. Do not send calendar exports, passwords or personal records to report a simple arithmetic issue.