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\datethis

\def\title{ABSTIME}

@* Intro. This tiny program prints the number of seconds

elapsed since 00:00:00 Greenwich Mean Time

on January 1, 1970. (Greenwich Mean Time is now more properly

called Coordinated Universal Time, or UTC.)

On January 19, 2038, at 03:14:08 UTC,

a 32-bit signed integer will become too small to hold the

desired result. (The number of elapsed seconds will then be $2^{31}$.)

This program will still work on

January 20 of that year if it has been compiled

with a \CEE/ compiler that has type \&{time\_t}

equivalent to \&{long}, provided that \&{long} integers

hold more than 32 bits.

@c

#include 

#include 

@#

main()

{

  printf("#define ABSTIME %ld\n",time(NULL));

  return 0;

}