Why it matters
Google asks for ISO 8601 dates with a timezone; ambiguous or inconsistent dates weaken freshness signals that Bing and AI engines use.
How to fix it
Emit full ISO 8601 timestamps with a timezone (2026-09-01T09:00:00Z) and keep dateModified ≥ datePublished.
References
More ai search rules
void geo reports 41 rules in this category. Generative-engine optimisation: whether AI crawlers that don't run JavaScript see the same content, valid and visible JSON-LD, an explicit AI robots policy, llms.txt, Markdown mirrors and answer-first writing.
home-entity-missingHome page lacks Organization + a single WebSite nodejsonld-schemaJSON-LD @context isn't schema.org or @type isn't a schema.org typejsonld-requiredStructured data type is missing Google-required propertiesjsonld-recommendedStructured data missing recommended propertiesbreadcrumb-invalidBreadcrumbList positions, names or item URLs are invalidfaq-deprecatedFAQPage/HowTo/SearchAction markup no longer produces rich resultsjsonld-id-unresolvedJSON-LD @id references don't resolvejsonld-not-visibleStructured data values don't appear on the page