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- From: dan@BBN-PROPHET.ARPA
- Date: Thu, 7 Aug 86 10:24:40 EDT
-
- I agree that time_t need not be able to represent times before 1970.
- However, I think it's rather short-sighted to say that time_t should never
- have its high-order bit set. That restricts it to representing times
- before January 2038. "UNIX will be dead by then!" you say; well, people
- have been predicting the death of Fortran and COBOL for a long time now,
- and it still hasn't happened, nor does it show any sign of happening. In
- UNIX's case the fact that it's the first portable operating system is
- likely to cause it to continue to exist in some form for MANY years. Even
- if UNIX itself doesn't last until 2038, it will certainly last long enough
- that application programmers will find it useful to be able to store and
- manipulate future time values later than 2038. They would undoubtedly
- appreciate it greatly if the system library routines supplied with UNIX
- worked for those time values.
-
- Personally I believe that time_t ought to be an unsigned long, rather than
- signed, but that would probably break a lot of existing code. Still, we
- should avoid later problems by specifying that library routines that work
- with time_t values should treat it as unsigned, and should work for the
- entire range of possible values. This at least makes it possible for
- careful programmers to get their code right.
-
- Most of the time-related facilities in UNIX have long been marked by
- an amazing short-sightedness. Let's not perpetuate it.
-
- Dan
-
- Volume-Number: Volume 6, Number 39
-
-