On Sun, Nov 4, 2018 at 2:35 PM Dave Horsfall <dave@horsfall.org> wrote:

UNIX was half a billion (500000000) seconds old on Tue Nov  5 00:53:20
1985 GMT (measuring since the time(2) epoch).
                -- Andy Tannenbaum

Hmmm...  According to my rough calculations, it hit a billion (US) seconds
around 2000.

It's over a billion and a half today:

% date +%s

1541371441