/* Report current TZ offset in minutes (positive for Europe, Asia, negative for Americas) */
/* It works in Windows, cygwin, Linux, Solaris, AIX! */

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

int main()
{
  int u_mins,u_date,l_mins,l_date,offset;
  time_t currtime = time(NULL);
  struct tm* ptm = gmtime(&currtime);
  u_mins = ptm->tm_hour*60+ptm->tm_min;
  u_date = ptm->tm_year*512+ptm->tm_mon*32+ptm->tm_mday;
  ptm = localtime(&currtime);
  l_mins = ptm->tm_hour*60+ptm->tm_min;
  l_date = ptm->tm_year*512+ptm->tm_mon*32+ptm->tm_mday;
  offset = l_mins - u_mins;
  if( u_date < l_date )
    offset += 24*60;
  else if( u_date > l_date )
    offset -= 24*60;
  printf("%d min (%.2f hr)\n",offset,(double)offset/60.0);
  return 0;
}