diff --git a/src/test/test_util.c b/src/test/test_util.c
index cc0181c92f9307a882b9226ce75ec83aa5fca150..f9a83a38a5895cc9e3403510a7bd5c944c985e4c 100644
--- a/src/test/test_util.c
+++ b/src/test/test_util.c
@@ -90,9 +90,15 @@ static void
 test_util_parse_http_time(void *arg)
 {
   struct tm a_time;
-
+  char b[ISO_TIME_LEN+1];
   (void)arg;
 
+#define T(s) do {                               \
+    format_iso_time(b, tor_timegm(&a_time));    \
+    tt_str_op(b, ==, (s));                      \
+    b[0]='\0';                                  \
+  } while (0)
+
   /* Test parse_http_time */
 
   test_eq(-1, parse_http_time("", &a_time));
@@ -105,26 +111,37 @@ test_util_parse_http_time(void *arg)
 
   test_eq(0, parse_http_time("Wednesday, 04 Aug 1994 00:48:22 GMT", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Wednesday, 4 Aug 1994 0:48:22 GMT", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Miercoles, 4 Aug 1994 0:48:22 GMT", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Wednesday, 04-Aug-94 00:48:22 GMT", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Wednesday, 4-Aug-94 0:48:22 GMT", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Miercoles, 4-Aug-94 0:48:22 GMT", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Wed Aug 04 00:48:22 1994", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Wed Aug 4 0:48:22 1994", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Mie Aug 4 0:48:22 1994", &a_time));
   test_eq((time_t)775961302UL, tor_timegm(&a_time));
+  T("1994-08-04 00:48:22");
   test_eq(0, parse_http_time("Sun, 1 Jan 2012 00:00:00 GMT", &a_time));
   test_eq((time_t)1325376000UL, tor_timegm(&a_time));
+  T("2012-01-01 00:00:00");
   test_eq(0, parse_http_time("Mon, 31 Dec 2012 00:00:00 GMT", &a_time));
   test_eq((time_t)1356912000UL, tor_timegm(&a_time));
+  T("2012-12-31 00:00:00");
   test_eq(-1, parse_http_time("2004-08-zz 99-99x99 GMT", &a_time));
   test_eq(-1, parse_http_time("2011-03-32 00:00:00 GMT", &a_time));
   test_eq(-1, parse_http_time("2011-03-30 24:00:00 GMT", &a_time));
@@ -134,6 +151,7 @@ test_util_parse_http_time(void *arg)
   test_eq(-1, parse_http_time("2011-00-30 23:59:59 GMT", &a_time));
   test_eq(-1, parse_http_time("2011-03-30 23:59", &a_time));
 
+#undef T
  done:
   ;
 }