Plain-language terms for using this site. Last updated 18 August 2026.
Not legal, tax or immigration advice
This is the important one. The calculators here do arithmetic on dates and times. They do not know which counting convention your contract, court rule, tax code or visa condition uses, and those conventions genuinely differ — some count the start date, some count only business days, some use a state or court holiday calendar rather than the federal one, and some define a month as 30 days rather than a calendar month.
Several pages on this site mention deadlines by name, including invoice terms, notice periods, statutory windows and exchange deadlines. Those mentions explain why people search for a particular number of days. They are not a statement of what your deadline is. Confirm any date that matters with the rule that governs it, or with someone qualified to read it for you.
No warranty
The site is provided as it is. We take correctness seriously — every calculation is checked on every build against an independent implementation, and known-good anchor dates are asserted in the test suite — but we do not warrant that every answer is correct for every purpose, and we accept no liability for a decision made on the basis of one. If you find an error, please report it.
Acceptable use
Use the calculators as much as you like. Do not scrape the site at a rate that degrades it for other people, do not attempt to interfere with it, and do not republish the generated pages wholesale. Linking to any page is welcome and needs no permission.
Advertising
The site carries display advertising. Advertisements are supplied by third parties and their content is not ours; an advertisement is not an endorsement. See the privacy policy for the data side of that.
Content and reuse
The text, the explanations and the arrangement of this site are ours. The underlying facts — that 30 days from a Tuesday is a Thursday, that Thanksgiving is the fourth Thursday in November — are facts and belong to nobody. Quote a figure freely; please do not copy the pages.
Changes
These terms may change. The date at the top of this page is when they last did.