diff --git a/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/blob/implementation/BlobRestProxy.java b/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/blob/implementation/BlobRestProxy.java
index b037a16c8f273..4f6f4a182902e 100644
--- a/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/blob/implementation/BlobRestProxy.java
+++ b/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/blob/implementation/BlobRestProxy.java
@@ -179,7 +179,7 @@ private Builder addPutBlobHeaders(CreateBlobOptions options, Builder builder) {
     private GetBlobPropertiesResult getBlobPropertiesResultFromResponse(ClientResponse response) {
         // Properties
         BlobProperties properties = new BlobProperties();
-        properties.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        properties.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
         properties.setBlobType(response.getHeaders().getFirst("x-ms-blob-type"));
         properties.setLeaseStatus(response.getHeaders().getFirst("x-ms-lease-status"));
 
@@ -323,7 +323,7 @@ private GetContainerPropertiesResult getContainerPropertiesImpl(String container
 
         GetContainerPropertiesResult properties = new GetContainerPropertiesResult();
         properties.setEtag(response.getHeaders().getFirst("ETag"));
-        properties.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        properties.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
         properties.setMetadata(getMetadataFromHeaders(response));
 
         return properties;
@@ -347,7 +347,7 @@ public GetContainerACLResult getContainerACL(String container, BlobServiceOption
         acl.setSignedIdentifiers(si.getSignedIdentifiers());
         acl.setPublicAccess(response.getHeaders().getFirst("x-ms-blob-public-access"));
         acl.setEtag(response.getHeaders().getFirst("ETag"));
-        acl.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        acl.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
 
         GetContainerACLResult result = new GetContainerACLResult();
         result.setValue(acl);
@@ -493,7 +493,7 @@ public GetBlobMetadataResult getBlobMetadata(String container, String blob, GetB
 
         GetBlobMetadataResult properties = new GetBlobMetadataResult();
         properties.setEtag(response.getHeaders().getFirst("ETag"));
-        properties.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        properties.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
         properties.setMetadata(getMetadataFromHeaders(response));
 
         return properties;
@@ -525,7 +525,7 @@ public SetBlobPropertiesResult setBlobProperties(String container, String blob,
         SetBlobPropertiesResult result = new SetBlobPropertiesResult();
 
         result.setEtag(response.getHeaders().getFirst("ETag"));
-        result.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        result.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
         if (response.getHeaders().getFirst("x-ms-blob-sequence-number") != null) {
             result.setSequenceNumber(Long.parseLong(response.getHeaders().getFirst("x-ms-blob-sequence-number")));
         }
@@ -552,7 +552,7 @@ public SetBlobMetadataResult setBlobMetadata(String container, String blob, Hash
 
         SetBlobMetadataResult result = new SetBlobMetadataResult();
         result.setEtag(response.getHeaders().getFirst("ETag"));
-        result.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        result.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
         return result;
     }
 
@@ -616,7 +616,7 @@ public CreateBlobSnapshotResult createBlobSnapshot(String container, String blob
         CreateBlobSnapshotResult blobSnapshot = new CreateBlobSnapshotResult();
         blobSnapshot.setEtag(response.getHeaders().getFirst("ETag"));
         blobSnapshot.setSnapshot(response.getHeaders().getFirst("x-ms-snapshot"));
-        blobSnapshot.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        blobSnapshot.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
 
         return blobSnapshot;
     }
@@ -733,7 +733,7 @@ private CreateBlobPagesResult updatePageBlobPagesImpl(String action, String cont
 
         CreateBlobPagesResult result = new CreateBlobPagesResult();
         result.setEtag(response.getHeaders().getFirst("ETag"));
-        result.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        result.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
         result.setContentMD5(response.getHeaders().getFirst("Content-MD5"));
         result.setSequenceNumber(Long.parseLong(response.getHeaders().getFirst("x-ms-blob-sequence-number")));
 
@@ -759,7 +759,7 @@ public ListBlobRegionsResult listBlobRegions(String container, String blob, List
         ListBlobRegionsResult result = response.getEntity(ListBlobRegionsResult.class);
         result.setEtag(response.getHeaders().getFirst("ETag"));
         result.setContentLength(Long.parseLong(response.getHeaders().getFirst("x-ms-blob-content-length")));
-        result.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        result.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
 
         return result;
     }
@@ -822,7 +822,7 @@ public ListBlobBlocksResult listBlobBlocks(String container, String blob, ListBl
         result.setEtag(response.getHeaders().getFirst("ETag"));
         result.setContentType(response.getHeaders().getFirst("Content-Type"));
         result.setContentLength(Long.parseLong(response.getHeaders().getFirst("x-ms-blob-content-length")));
-        result.setLastModified(dateMapper.parseNoThrow(response.getHeaders().getFirst("Last-Modified")));
+        result.setLastModified(dateMapper.parse(response.getHeaders().getFirst("Last-Modified")));
 
         return result;
     }
diff --git a/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/blob/implementation/RFC1123DateConverter.java b/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/blob/implementation/RFC1123DateConverter.java
index 48545adfcb5bc..f8dc6fc29c31c 100644
--- a/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/blob/implementation/RFC1123DateConverter.java
+++ b/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/blob/implementation/RFC1123DateConverter.java
@@ -17,16 +17,13 @@ public String format(Date date) {
         return getFormat().format(date);
     }
 
-    public Date parse(String date) throws ParseException {
-        return getFormat().parse(date);
-    }
-
-    public Date parseNoThrow(String date) {
+    public Date parse(String date) {
         try {
-            return parse(date);
+            return getFormat().parse(date);
         }
         catch (ParseException e) {
-            return null;
+            String msg = String.format("The value \"%s\" is not a valid RFC 1123 date.", date);
+            throw new IllegalArgumentException(msg, e);
         }
     }
 
diff --git a/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/queue/implementation/QueueRestProxy.java b/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/queue/implementation/QueueRestProxy.java
index 168f6944cfbbc..76c004da179d7 100644
--- a/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/queue/implementation/QueueRestProxy.java
+++ b/microsoft-azure-api/src/main/java/com/microsoft/windowsazure/services/queue/implementation/QueueRestProxy.java
@@ -249,7 +249,7 @@ public UpdateMessageResult updateMessage(String queue, String messageId, String
 
         UpdateMessageResult result = new UpdateMessageResult();
         result.setPopReceipt(response.getHeaders().getFirst("x-ms-popreceipt"));
-        result.setTimeNextVisible(dateMapper.parseNoThrow(response.getHeaders().getFirst("x-ms-time-next-visible")));
+        result.setTimeNextVisible(dateMapper.parse(response.getHeaders().getFirst("x-ms-time-next-visible")));
         return result;
     }