Schema dates are valid
What the check finds
A date inside the structured data is not valid ISO 8601. Consumers usually drop the field rather than the whole object, so freshness signals are lost but the entity still resolves.
Why it matters for AI answers
Search engines and AI systems use dates to judge how fresh content is. A date that is not valid ISO 8601 is usually dropped, so that freshness signal is lost.
How to fix it
- Write dates in ISO 8601 format, for example 2026-03-15 or 2026-03-15T09:30:00+00:00.
- Avoid formats like 15/03/2026 or "March 15, 2026" in datePublished and dateModified.
- Include a time zone offset when a time is given.
Related checks
Review this finding in context: Structured data guide ›
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