diff --git a/tests/libtest/lib517.c b/tests/libtest/lib517.c
index e769ae5af5..000e86d36d 100644
--- a/tests/libtest/lib517.c
+++ b/tests/libtest/lib517.c
@@ -98,6 +98,15 @@ static const struct dcheck dates[] = {
   {"Thu Apr 18 22:50:12 2007 GMT", 1176936612 },
   {"Thu Apr 18 2007 22:50:12 GMT", 1176936612 },
   {"Thu Apr 18 2007 GMT 22:50:12", 1176936612 },
+
+  {"\"Thu Apr 18 22:50:12 2007 GMT\"", 1176936612 },
+  {"-\"22:50:12 Thu Apr 18 2007 GMT\"", 1176936612 },
+  {"*\"Thu 22:50:12 Apr 18 2007 GMT\"", 1176936612 },
+  {";\"Thu Apr 22:50:12 18 2007 GMT\"", 1176936612 },
+  {".\"Thu Apr 18 22:50:12 2007 GMT\"", 1176936612 },
+  {"\"Thu Apr 18 2007 22:50:12 GMT\"", 1176936612 },
+  {"\"Thu Apr 18 2007 GMT 22:50:12\"", 1176936612 },
+
   {"Sat, 15-Apr-17 21:01:22 GMT", 1492290082 },
   {"15-Sat, Apr-17 21:01:22 GMT", 1492290082 },
   {"15-Sat, Apr 21:01:22 GMT 17", 1492290082 },