#include <glib.h>
#include <time.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
	GTimeZone *tz;
	time_t ref_time;
	char buf[64];
	gint interval;

	g_assert(argc >= 3);
	tz = g_time_zone_new(argv[1]);
	ref_time = (time_t) strtol(argv[2], NULL, 0);
	interval = g_time_zone_find_interval(tz, G_TIME_TYPE_UNIVERSAL, ref_time);
	strftime(buf, sizeof(buf), "%T %F", gmtime(&ref_time));
	g_message("%ld = %s: interval %d: offset vs. UTC = %d minutes",
		(long int) ref_time, buf, interval, g_time_zone_get_offset(tz, interval) / 60);
	g_time_zone_unref(tz);
	return 0;
}