Editorial standards

Research

Factual calendar claims are based on standard Gregorian calendar behavior. Cultural topics cite commonly accepted secondary references and avoid unsupported historical certainty.

Calculation testing

Core birthday math is covered by automated unit tests, including leap years, February 29 edge cases, and local-date parsing without UTC shifts.

Sources

Prefer primary or well-established secondary sources. Entertainment classifications are labeled as such.

Affiliate relationships

Affiliate recommendations appear only when contextually relevant and remain disabled until SiteStripe-generated URLs are supplied. See the affiliate disclosure.

Informational vs entertainment

Calendar calculations are informational. Astrology, birthstones, and generations are entertainment-oriented cultural classifications.