dateModified

dateModified is a Schema.org property that indicates when content was last updated. It is a critical freshness signal for AI engines.

Why It Matters for GEO

Perplexity and ChatGPT give a ranking boost to recent content. An article with dateModified "2025-01-02" will be preferred over an equivalent dated "2023-06-15", even if the content is similar.

How to Optimize

1. Include in your Article Schema.org markup
2. Display visually on the page ("Last updated...")
3. Update with every significant revision
4. Do not change without a real modification (considered spammy)

Implementation

{
  "@type": "Article",
  "datePublished": "2024-06-01",
  "dateModified": "2025-01-02"
}

Visible display:

<time datetime="2025-01-02">Last updated January 2, 2025</time>