If you read the Google Docs in XML Sitemaps and look at the lastmod field, Google says, "Google reads the value for lastmod. However, if you misrepresent this value, we will stop reading it." Lily Ray asked Google's John Mueller if changing a page's last mod date too often would cause problems.

Here are the posts on Twitter:

I don't think you'd add commas on a large scale :), I wouldn't worry about individual pages even if you have a bunch of things that you end up updating regularly.

– 🍌 John 🍌 (@JohnMu) August 27, 2020

This is an interesting question because, as Lily points out, some CMS platforms can inadvertently update the lastmod data on many pages without anyone noticing and with minor changes. Ultimately, this can cause Google to ignore the lastmod information sent in the XML sitemap for that site.

John explained, "Do you mean the date in the markup on the page or the date in the sitemap file? I think people get things a little bit confused. For a sitemap file, any change to the primary content of the page is fine to." to mark them. " just to record changes again. "

Do you mean the date in the markup on the page or the date in the sitemap file? I think people mix things up a bit. With a sitemap file, any change to the primary content of the page is fine to mark it up. It's just a matter of recording changes again.

– 🍌 John 🍌 (@JohnMu) August 27, 2020

(This thread has gotten better, but different :-))
For SD, I would use major content updates (as this is indicated and would otherwise be misleading). In the case of sitemaps, every change that has to be redrawn can be marked. I doubt you would notice any difference in search engine optimization.

– 🍌 John 🍌 (@JohnMu) August 27, 2020

Will Google damage the website if the last modified date is ignored in an XML sitemap? Probably not in terms of ranking, but if you want to get content or content updates to Google faster, it can be helpful for Google to trust your lastmod data information.

Forum discussion on Twitter.

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