structured-data.invalid-date
Date properties in structured data that are not ISO 8601.
What to change
Use ISO 8601 dates such as 2026-03-14 or 2026-03-14T09:30:00+01:00.
The documentation on developers.google.comA finding of this rule on a page carries the exact edits for that page: the markup it quotes, and what to write instead.
When it runs
Runs on every SEO audit: of a page, a crawl, a build directory or HTML. A warning is a problem that costs a page ranking, clicks or citations. Each finding takes 5 points off the page's score.
The severity here is the rule's usual one: a finding can be raised or lowered when the page gives a reason.
Run it, or skip it
Check a page for this rule alone, after a fix for instance:
npx @rivi-software/agentic-seo-check audit https://example.com --rule structured-data.invalid-date
Or from an assistant, with the MCP tool seo_audit_page:
{
"url": "https://example.com",
"rules": [
"structured-data.invalid-date"
]
}
To leave it out of an audit, pass --disable structured-data.invalid-date on the command, or disableRules: ["structured-data.invalid-date"] to a tool.
More in Structured data
All 14 rules- Warning
structured-data.missing-contextA JSON-LD item has no @context or a context other than schema.org. - Warning
structured-data.missing-typeA structured data item has no @type (or itemtype). - Warning
structured-data.missing-requiredA structured data item of a known type is missing properties Google requires for rich results. - Info
structured-data.missing-recommendedA structured data item is missing properties Google recommends for richer results. - Info
structured-data.retired-typeThe page has structured data for a rich result Google no longer shows: FAQPage, HowTo, SpecialAnnouncement, ClaimReview, the sitelinks search box's SearchAction, Estimated Salary (Occupation), Learning Video (LearningResource on a VideoObject) or Book Actions (ReadAction, BorrowAction on a Book). - Warning
structured-data.invalid-valueA structured data value is in a form Google cannot use: a price with a currency symbol or a decimal comma, a currency that is not an ISO 4217 code, a rating outside its scale, a breadcrumb trail with fewer than two items, odd positions or crumbs without a URL, or an availability, itemCondition, eventStatus, eventAttendanceMode or employmentType that is not one of the values Google lists. - Info
structured-data.relative-urlA URL in JSON-LD (url, image, logo, item, sameAs, ...) is relative. JSON-LD does not resolve these properties against the page URL, and Google documents only absolute URLs. - Info
structured-data.dangling-idJSON-LD refers to an object by "@id" that no object on the page defines, so a reader of this page gets the id and none of the object's properties.