$time = get_blog_details($blog_ID)->registered;
$unix_time = strtotime($time);
$my_time_format = date('Y-m-d H:i:s', $time); // eg. 2011-09-28 00:20:34
$diff_format = human_time_diff($time); // eg. 2 days
See date() and replace Y-m-d H:i:s
with the format you want
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