An accurate lastmod helps Google prioritise recrawling changed pages. If it is missing, or set to the current time on every generation, it tells Google nothing useful and can train it to ignore the field. No accurate last-modified dates. Google uses lastmod as a recrawl hint; inaccurate values erode trust in it.
Why does lastmod missing or always-now matter for AI search?
Google uses lastmod as a recrawl hint; inaccurate values erode trust in it.
How do you fix it?
Emit accurate lastmod reflecting real changes.
How do you find it on your site?
- Inspect the lastmod values across the sitemap.
- Check whether they reflect real content changes or just the build time.
- Set lastmod to the genuine last-modified date of each page.
- Avoid bumping it when nothing meaningful changed.
Which ranking and citation factors does it touch?
A truthful lastmod supports crawl efficiency and freshness. A fake one is discounted and can reduce trust in the signal.
What is the impact?
Low-medium recrawl efficiency. Inferred.
What is the evidence?
Accurate lastmod aids recrawl scheduling. Google Search Central, Build and submit a sitemap
Frequently asked questions about lastmod missing or always-now
What does "lastmod missing or always-now" mean?
No accurate last-modified dates.
How do you fix lastmod missing or always-now?
Emit accurate lastmod reflecting real changes.