A few years ago, someone asked for a better explanation of t_time_info within Analytics, ref, but the post doesn't have a thorough response other than mentioning that it comes from the web client (presumably Launch as versus processed web hits).
One can see through Data Feeds, etc., that this value isn't set on all web hits, so the questions are as follows:
Under what conditions does this value populate automatically?
Can this value be set manually through Launch?
If the setting of this value is arbitraty, like suggested by @Gigazelle , why does it exist? Is it just a Satellite holdover?