Re: Date processing

[Marcus G. Daniels]

>>>>> "B" == Benedikt Stefansson <address@hidden> writes:

B> For example I can't for the life of me understand why this
B> program crashes with a seg fault:

There are three problems with this test program:

  1) The reason it crashes is because you are passing pointers
     to strptime that don't point to anything.

  2) time_t is relative to 1970, so 1900 won't work.

  3) difftime is first_argument - second_argument

Here's the updated test program:

#include <time.h>
#include <stdio.h>

int
main (int argc, const char **argv)
{
  struct tm tm1;
  struct tm tm2;
  double diff;

  strptime ("1/1/1980", "%m/%d/%Y", &tm1);
  strptime ("11/15/1999", "%m/%d/%Y", &tm2);
  diff = difftime (mktime (&tm2), mktime (&tm1));

  printf ("Difference is %f\n", diff);
  return 0;
}

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