Nearly all blogging software offers the ability to edit post dates arbitrarily, and this has been the case since the dawn of blogging. It is very surprising if

Nearly all blogging software offers the ability to edit post dates arbitrarily, and this has been the case since the dawn of blogging. It is very surprising if Google is trusting these as-is. btw on the social media side of Tumblr (dashboard feed of followed blogs), the user-editable post date is ignored, so it cannot be used for manipulating the dashboard sort order.