diff --git a/lib/cert-info.js b/lib/cert-info.js
index b7bc669..394b7bf 100644
--- a/lib/cert-info.js
+++ b/lib/cert-info.js
@@ -51,12 +51,12 @@ if (require.main === module) {
   console.info('');
 
   console.info(c.notBefore.value);
-  console.info(Date(c.notBefore.value).valueOf());
+  console.info(new Date(c.notBefore.value).valueOf());
 
   console.info('');
 
   console.info(c.notAfter.value);
-  console.info(Date(c.notAfter.value).valueOf());
+  console.info(new Date(c.notAfter.value).valueOf());
 
   console.info('');
 }
diff --git a/tests/cert-info.js b/tests/cert-info.js
new file mode 100644
index 0000000..525ce94
--- /dev/null
+++ b/tests/cert-info.js
@@ -0,0 +1,21 @@
+'use strict';
+
+var certInfo = require('../lib/cert-info.js');
+
+var c = certInfo.testGetCertInfo();
+
+console.info('');
+
+console.info(c.notBefore.value);
+console.info(new Date(c.notBefore.value).valueOf());
+
+console.info('');
+
+console.info(c.notAfter.value);
+console.info(new Date(c.notAfter.value).valueOf());
+
+console.info('');
+
+console.info('');
+console.info('If we got values at all, it must have passed.');
+console.info('');