#define _XOPEN_SOURCE
#include <time.h>
#define __USE_UNIX98
#include <stdio.h>
#include <string.h>

int mktime_test(const char* str)
{
	struct tm local_tm, local_tm2;
	time_t local_time;
	char buffer[128];

	memset(buffer, 0, sizeof(buffer));
	puts(str);
	if (strptime(str, "%Y-%m-%d %H:%M:%S", &local_tm) == NULL)
	{
		fprintf(stderr, "failed to convert `%s' to struct tm\n", str);
		return 1;
	}
	snprintf(buffer, sizeof(buffer), "%d-%02d-%02d %02d:%02d:%02d",
			local_tm.tm_year + 1900, local_tm.tm_mon + 1, local_tm.tm_mday,
			local_tm.tm_hour, local_tm.tm_min, local_tm.tm_sec);
	puts(buffer);
	if (strcmp(str, buffer) != 0)
	{
		fprintf(stderr, "strptime() failed\n");
		return 1;
	}
	local_tm.tm_isdst = -1;
	local_time = mktime(&local_tm);
	localtime_r(&local_time, &local_tm2);
	snprintf(buffer, sizeof(buffer), "%d-%02d-%02d %02d:%02d:%02d",
			local_tm2.tm_year + 1900, local_tm2.tm_mon + 1, local_tm2.tm_mday,
			local_tm2.tm_hour, local_tm2.tm_min, local_tm2.tm_sec);
	puts(buffer);
	if (strcmp(str, buffer) != 0)
	{
		fprintf(stderr, "mktime() or localtime_r() failed\n");
		return 1;
	}
	return 0;
}

int main()
{
	mktime_test("1981-07-01 00:00:00");
	mktime_test("1981-07-01 00:00:00");
	return 0;
}