1 files changed, 57 insertions, 0 deletions
diff --git a/time/test-tz.c b/time/test-tz.c
new file mode 100644
index 0000000000..47565cedec
--- /dev/null
+++ b/time/test-tz.c
@@ -0,0 +1,57 @@
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+#include <stdio.h>
+
+struct {
+  const char *	env;
+  time_t	expected;
+} tests[] = {
+  {"TZ=MST",		832935315},
+  {"TZ=",		832910115},
+  {"TZ=:UTC",		832910115},
+  {"TZ=UTC",		832910115},
+  {"TZ=UTC0",		832910115}
+};
+
+
+int
+main(int argc, char ** argv)
+{
+  int errors = 0;
+  struct tm tm;
+  time_t t;
+  int i;
+
+  memset (&tm, 0, sizeof (tm));
+  tm.tm_isdst = 0;
+  tm.tm_year  = 96;	/* years since 1900 */
+  tm.tm_mon   = 4;
+  tm.tm_mday  = 24;
+  tm.tm_hour  =  3;
+  tm.tm_min   = 55;
+  tm.tm_sec   = 15;
+
+  for (i = 0; i < sizeof (tests) / sizeof (tests[0]); ++i)
+    {
+      putenv (tests[i].env);
+      tzset ();
+      t = mktime(&tm);
+      if (t != tests[i].expected)
+	{
+	  printf ("%s: flunked test %d (expected %lu, got %lu)\n",
+		  argv[0], i, (long) tests[i].expected, (long) t);
+	  ++errors;
+	}
+    }
+  if (errors == 0)
+    {
+      puts ("No errors.");
+      exit (EXIT_SUCCESS);
+    }
+  else
+    {
+      printf ("%d errors.\n", errors);
+      exit (EXIT_FAILURE);
+    }
+}