SEO019 · JSON-LD date format
Severity: info
What it checks
Section titled “What it checks”Flags a value under a known date key (datePublished, dateModified, startDate, …) that is not ISO-8601. Reduced precision allowed by schema.org is accepted — year (2026), year-month (2026-06), full date, and date-time all pass.
Why it matters
Section titled “Why it matters”Schema.org date properties expect ISO-8601; other formats may be ignored or misparsed.
How to fix
Section titled “How to fix”"datePublished": "2026-06-26"