I had some real experts working for me (as opposed to "popular science" Cassandra doomsayers), and we were pretty sure that Y2K was not a big deal ...
... BUT I knew some guys in Australia, and when it turned 01/01/2000 Down Under, I was on the phone ascertaining whether the apocalypse had arrived yet. It had not, nor had it when midnight arrived in France or Britain, so I knew we were OK.
Like being able to look into the future, talking to Australia ... !