I’m not sure what you are trying to do but
human_time_difffunction is responsible for determining this functionality. And this function takes in two arguments:
$from – Unix timestamp from which the difference begins.
$to – (Optional) Unix timestamp to end the time difference. Default becomes time() if not set.
turn off the human time diff on the admin tables
There’s no information in the tables about the “diff”, the date at which the post was created, get’s passed to this function which determines the human readable format. You can just query for the date and deal with it how you see fit, skipping the function.