structured-data.invalid-date

WarningSEO audit

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.com

A 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.

All 14 rules