I have no experience with xpath from java but what you can do is set the loglevel of the database_retrieve to trace and see what that gives you. For example in my app this gives me this.
RequestAnalyzer: incoming request dj (depth = -1, amount = 50): //Product.Product[ArticleNumber != empty and ArticleNumber != ''][(changedDate>=1419980400000) and (Blocked='false')]
From the above i assume you need to convert your dateTime to a timestamp in order to use it in xpath.
Hi Ronald,
What is the default language of your application? If Dutch, try "30-12-2014". If US English, "12-30-2014" might do the trick.