Gary Illyes from Google said that you are amended disconnected not utilizing a lastmod day successful your XML Sitemap if those dates are wrong. He said connected Bluesky, "probably amended disconnected without the lastmods. astatine slightest you prevention a fewer bytes."
This reply was successful consequence to Jason Kilgore's question, which asked:
Would a tract beryllium amended disconnected pinch nary lastmod day astatine each connected immoderate pages? Or 1 wherever the lastmod day isn't reliable/trusted (given the binary quality of Google's spot connected this)? We recovered a bug manifesting a group of unintentionally incorrect dates.This really isn't caller advice, arsenic Google has said earlier that Google would trust aliases not spot the lastmod date based connected if that day has been utilized correctly connected your tract aliases not. You should only alteration the lastmod day for important changes to the web page, only erstwhile there is thing new, not for copyright changes, Google said. Google besides said astir changing the lastmode day excessively frequently, It was truthful bad that backmost successful 2015, Google said it mostly ignored the lastmod date but successful 2017 changed course pinch that language. John Mueller said changing the lastmod day is not an SEO hack.
Here are those caller posts connected this taxable that I covered above:
In short, usage the lastmod day correctly and don't effort to instrumentality Google.
Forum chat astatine Bluesky.
