Correct the fact, not only the timestamp.
Readers can report factual, formula, accessibility, or source issues through the contact page.
Triage
Safety-significant errors, broken calculations, privacy exposure, and misleading commercial claims receive priority. A correction should identify the affected formula version and whether previous saved or printed results may differ.
Publication
Low-risk formatting fixes may publish directly. Formula, claim, recommendation, legal, safety, and sponsored changes require the appropriate review level and a relevant test update.