Updated tests

tests/ttail_init_check.c

 	char *arg[] = {NULL, NULL};
 	struct tm zero;
 
-	memset(&zero, 0, sizeof(struct tm));
+	memset(&zero, -1, sizeof(struct tm));
 
 	ret = ttail_set_dates(ttail, arg);
 	ck_assert_int_eq(ret, 0);
 	strcpy(arg0, arg[0]);
 	arg[0]=arg0;
 
-	memset(&zero, 0, sizeof(struct tm));
+	memset(&zero, -1, sizeof(struct tm));
 
 	ret = ttail_set_dates(ttail, arg);
 	ck_assert_int_eq(ret, 0);
 	strcpy(arg1, arg[1]);
 	arg[1]=arg1;
 
-	memset(&zero, 0, sizeof(struct tm));
+	memset(&zero, -1, sizeof(struct tm));
 
 	ret = ttail_set_dates(ttail, arg);
 	ck_assert_int_eq(ret, 0);
 	ck_assert_int_eq(ttail->date_max.tm_year, 188);
 	ck_assert_int_eq(ttail->date_max.tm_mon, 9);
 	ck_assert_int_eq(ttail->date_max.tm_mday, 22);
-	ck_assert_int_eq(ttail->date_max.tm_hour, 0);
-	ck_assert_int_eq(ttail->date_max.tm_min, 0);
-	ck_assert_int_eq(ttail->date_max.tm_sec, 0);
+	ck_assert_int_eq(ttail->date_max.tm_hour, -1);
+	ck_assert_int_eq(ttail->date_max.tm_min, -1);
+	ck_assert_int_eq(ttail->date_max.tm_sec, -1);
 }
 END_TEST