#include <iostream>
#include <cstdlib>
#include <ctime>

int main() {
  /* not an issue if not 64-bit */
  if (sizeof(struct tm) <= 4)
	return EXIT_SUCCESS;

  setenv("TZ", "UTC", 1);

  /* just within the 32-bit boundaries */
  struct tm tb_upper = { 7, 14, 3, 19, 0, 138, 0, 0, -1 };
  struct tm tb_lower = { 52, 45, 20, 13, 11, 1, 0, 0, -1 };

  time_t i_upper = std::mktime(&tb_upper);
  time_t i_lower = std::mktime(&tb_lower);

  /* step over the boundaries */
  tb_upper.tm_sec += 1;
  tb_lower.tm_sec -= 1;

  time_t o_upper = std::mktime(&tb_upper);
  time_t o_lower = std::mktime(&tb_lower);

  if (o_upper == -1)
	std::cout << "Upper boundary wrong (got -1)\n";
  else if (o_upper - i_upper != 1)
	std::cout << "Upper boundary wrong (differs by "
			  << (o_upper - i_upper) << ")\n";

  if (o_lower == -1)
	std::cout << "Lower boundary wrong (got -1)\n";
  else if (o_lower - i_lower != -1)
	std::cout << "Lower boundary wrong (differs by "
			  << (o_lower - i_lower) << ")\n";

  return EXIT_SUCCESS;
}