Useful date answers,
with the rules visible.
CalcSpan is an independent calculator project focused on date, deadline, duration and recurring-cycle questions.
What CalcSpan does
The site turns common date and time questions into browser-based tools. It aims to show the counting rule, assumptions, source trail and review date beside the answer, especially when a result depends on a jurisdiction, official schedule or product rule.
Who operates it
CalcSpan is maintained by the CalcSpan project operator. The site does not currently publish a separate registered-company name, street address, individual author roster or professional credentials. Nothing on CalcSpan should be read as a claim that a licensed medical, legal, tax, financial or other professional authored or approved a page unless that page expressly names a reviewer and the scope of that review.
How trust is earned
Calculators are generated from a registry and a versioned rule record. The release process checks calculations, boundary cases, source links, presentation and indexing readiness. Higher-risk tools are framed as references and include prompts to verify decisions with the relevant authority or professional.
Read the full editorial and review policy and calculation methodology.
What CalcSpan is not
CalcSpan is not an official agency, professional practice, emergency service or substitute for advice. Source-and-calculation review is narrower than professional review. Linked organizations do not sponsor or endorse CalcSpan merely because their public material is cited.
Corrections
If a rule, source, calculation or description appears wrong or out of date, send the page address, the issue and any supporting official source to [email protected]. Reports are assessed against the published source and test trail; no response-time promise is made.