Re: [PATCH] posixtm: don't reject a time with "60" as the number of seconds

[Paolo Bonzini]

> > Going backwards from "cal 1 1" you can see that in
> > the Julian calendar 01-Jan-0000 was a Thursday, but that's not so
> > relevant.
> >
> > However cal can help seeing that 01-Jan-0000 is a Saturday in
> > Gregorian proleptic calendar (i.e. extending Gregorian calendar before
> > the day when it was adopted).  400 years have 146097 days, which is
> > divisible by 7, and 01-Jan-2000 was a Saturday.
>
> If that's true, then this new test failure suggests there's a bug in mktime.

For the record, GNU Smalltalk gives the same answer.

But mktime seems to work here:

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

int main()
{
  const char days[7][4] = {
   "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  };
  struct tm tm;
  time_t t;
  memset (&tm, 0, sizeof (tm));
  tm.tm_mon = 0;
  tm.tm_mday = 1;
  tm.tm_year = -1900;
  setenv ("TZ", "GMT");
  t = mktime (&tm);
  printf ("%ld\n", t);
  printf ("%s %d\n", days[tm.tm_wday], tm.tm_yday);
  printf ("%s", ctime(&t));
  tm = *gmtime(&t);
  printf ("%d %d %d %s\n", tm.tm_mon, tm.tm_mday, tm.tm_year, 
days[tm.tm_wday]);
}


$ ./a.out
-62167219200
Sat 0
Sat Jan  1 00:00:00 0
0 1 -1900 Sat

Paolo