Create vCAC entity using vCAC plugin? Issue with LocalDateTime?

I need some help creating a vCAC entity using the vCAC plugin. Here is the code snippet that I use:

// Inputs: host, entitySetName, propertyNames[], propertyValues[]

var modelName = 'ManagementModelEntities.svc';

var links = null;

var headers = null;

var inputProperties = new Properties();

for (var i = propertyNames.length - 1; i >= 0; i -= 1) {

  inputProperties.put(propertyNames[i], propertyValues[i]);  

}

var rEntity = vCACEntityManager.

  createModelEntity(host.id, modelName, entitySetName, inputProperties, links, headers);

if (rEntity == null) {

  throw "Unable to create " + entitySetName + " entity";

}

else {

  System.log("Created " + entitySetName + " entity");

}

However, this snippet fails with the following error:

    Unable to convert java.lang.String into org.joda.time.LocalDateTime (Workflow:CreateEntity / Create Entity (item1)#11)

I then tried with the following lines but with no luck:

inputProperties.put('CreatedDate', new org.joda.time.LocalDateTime(1972, 12, 3, 0, 0));

inputProperties.put('LastModifiedDate', new org.joda.time.LocalDateTime(1972, 12, 3, 0, 0));

I am having trouble finding a way to specify values for these two properties: CreatedDate & LastModifiedDate (the datatype being: org.joda.time.LocalDateTime).

Appreciate any help.