diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b987af..6dabbb2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,11 @@
 This log documents significant changes for each release.  This project follows
 [Semantic Versioning](http://semver.org/).
 
+## [0.12.2] - 2019-05-15
+### Fixed
+- Corrected output in the demo website for results containing dates and times.
+- Cleaned up the error message output for parsing errors.
+
 ## [0.12.1] - 2019-05-13
 ### Fixed
 - Updated links to the repository to point to the new location.
diff --git a/demo/public/app.css b/demo/public/app.css
index 26b6cf1..71a021d 100644
--- a/demo/public/app.css
+++ b/demo/public/app.css
@@ -23,8 +23,10 @@ body {
   display: flex;
   flex-direction: row;
 }
-#input {
+#inputWrapper {
   flex: 1;
+}
+#input {
   margin-top: 3px;
 }
 
diff --git a/demo/public/app.js b/demo/public/app.js
index 1eb01d2..2165075 100644
--- a/demo/public/app.js
+++ b/demo/public/app.js
@@ -29,13 +29,24 @@ function evaluate(){
   try  {
     var inputType = document.querySelector('input[name="inputType"]:checked').value
     var inputText = cm.getValue();
-    var res = inputType === 'yaml' ? yaml.safeLoad(inputText) : JSON.parse(inputText);
-    console.log(pathNode.value, res);
-    var result = fhirpath.evaluate(res, pathNode.value);
-    outNode.innerHTML = '<pre />';
-    outNode.childNodes.item(0).textContent = yaml.dump(result);
+    var expr = pathNode.value;
+    if (expr.trim() != '') {
+      var res = inputType === 'yaml' ? yaml.safeLoad(inputText) : JSON.parse(inputText);
+      console.log(pathNode.value, res);
+      var result = fhirpath.evaluate(res, expr);
+      outNode.innerHTML = '<pre />';
+      // yaml.dump will pick up internal keys, e.g. "asStr" in the FP_Type
+      // objects (dates and times).  Apparently, toString() is not called on the
+      // objects during yaml.dump, so we take care of that by calling toJSON
+      // first, parsing that, and then creating the yaml output.
+      outNode.childNodes.item(0).textContent =
+      yaml.dump(JSON.parse(JSON.stringify(result)));
+    }
   } catch (e) {
-    outNode.innerHTML = '<pre style="color: red;" />';
+
+    outNode.innerHTML = '<div style="color: red;" />';
+    var msg = e.toString();
+    msg.replace(/\n/, '<br>');
     outNode.childNodes.item(0).textContent = e.toString();
     console.error(e);
   }
diff --git a/package.json b/package.json
index 460490e..184bca6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fhirpath",
-  "version": "0.12.1",
+  "version": "0.12.2",
   "description": "A FHIRPath engine",
   "main": "src/fhirpath.js",
   "dependencies": {
diff --git a/src/parser/index.js b/src/parser/index.js
index 9d90e73..fabe7e0 100644
--- a/src/parser/index.js
+++ b/src/parser/index.js
@@ -85,8 +85,8 @@ var parse = function(path){
     let errMsgs = [];
     for (let i=0, len=errors.length; i<len; ++i) {
       let err = errors[i];
-      errMsgs.push("rec: "+err[0]+"; sym: "+err[1]+"; line: "+err[2]+"; col: "+
-        err[3]+"; msg: "+err[4]+"; e: "+err[5]);
+      let msg = "line: "+err[2]+"; column: "+ err[3]+"; message: "+err[4];
+      errMsgs.push(msg);
     }
     var e = new Error(errMsgs.join("\n"));
     e.errors = errors;