>> This is a question from someone who doesn't grok C - can't they
>> declare time_t as unsigned?

In most applications, if used with care, this will work fine. Unfortunately 
time_t is used to hold two completely different kinds of quantities:

A) Points in time: like "15 seconds after noon on December 12, 2012"

B) Durations like "6 days, 2 hours, 27 minutes, 33 seconds" (expressed as a 
number of seconds).


It is the latter use that can easily cause trouble. If an interval is 
expressed as 'end-start' the result is positive, but if it is represented as 
'start-end' it becomes negative.

--- Bob Ammerman
RAm Systems

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