From The Jargon File (version 4.4.7, 29 Dec 2003) :
since time T equals minus infinity
adv.
A long time ago; for as long as anyone can remember; at the time that some
particular frob was first designed. Usually the word ?time? is omitted. See
also time T; contrast epoch.
From The Free On-line Dictionary of Computing (30 December 2018) :
since time T equals minus infinity
A long time ago; for as long as anyone can remember; at the
time that some particular frob was first designed. Usually
the word "time" is omitted. See also time T; contrast
epoch.
[{Jargon File]