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Re:Ask HN: Is the past disappearing on the web? by qw on Wednesday January 26, 2022 @10:18AM (#30086511)
"last modified" only works for static content, and not pages that are rendered dynamically or where the header is set based on cache settings.

Even for static content, the date may be wrong as the output may have been generated multiple times since it was first created.

Re:Ask HN: Is the past disappearing on the web? by shishironline on Wednesday January 26, 2022 @11:18AM (#30087379)
Thanks for the info
Re:Ask HN: Is the past disappearing on the web? by iggldiggl on Friday January 28, 2022 @09:05AM (#30114690)
Wordpress-based blogs (maybe others, too) often have a timestamp hidden in an HTML Meta-tag even if the date is otherwise hidden from regular view.