Building on Windows from scratch - difftime problem found ( was datediff )

[Derek Atkins]

Gary Bilkus <mail at gary.bilkus.com> writes:

> Given that time_t is always a signed integer value, wouldn't
>
> return (double)(time1-time2)
>
> just work anyway, at least as far as a patch for mingw is concerned?

Is it always a signed integer?  Can't it sometimes be unsigned?

This is the "year 2037" problem, where 32-bit unsigned time rolls over.
However there is also a "Year 2106" problem, which is where 32-bit
unsigned time rolls over.  I think there *are* some systems where it's
unsigned, but still 32 bits.  Or at least there are apps where that is
the case.

-derek

-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
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