[erlang-questions] Getting system start time in UTC?

[Roger Lipscombe]

I can get the node's uptime with erlang:statistics(wall_clock), which
is in milliseconds, and can easily be converted into days, hours, etc.
representing how long this node has been up.

Is there an easy way to get the start time of the node, represented as
a UTC date/time? I'd like to be able to print "Up since dd/MM/yyyy (D
days ...", etc.

Obviously, I *could* subtract the uptime from the current date/time,
but that seems more complicated than necessary, assuming the node has
(somewhere) the actual start time.

Thanks,
Roger.