About Almanac.tools
Updated
Independent editorial team. Every numeric claim cites a primary source — IRS / agency publication, federal or state statute, or controlling case law.
Almanac.tools builds production-grade APIs around reference data that developers shouldn't have to assemble themselves. We started with business-day math — settlement-date calculations, market-specific calendars, regional subcalendars — because every fintech, HR-tech, and legal-tech engineer we've talked to has built a half-broken version of this internally.
How we keep the data accurate
Every holiday entry in our data files cites a primary source — an official government or exchange publication — with a verbatim quote of the relevant text. We run an audit script every month that re-fetches each cited URL and verifies the quote still matches.
Our test suite (200+ edge cases) is published under CC0 on GitHub. If you find a date we get wrong, file an issue.
What we won't do
- We don't offer SLAs.
- We don't do custom enterprise work.
- We don't scrape — every data point has an official primary source.
- We don't use AI to generate or summarize holiday data. Hand-curated, with citations.
Contact
Email support@almanac.tools. Response time: typically <24 hours, often much faster.