Composer speak date variable

Hello there!
I am having a difficulty announcing the date that I store in a variable. My date has the following form: 2013-07-02
If I set it as a string the application announces it without a problem. But when setting it to Date inside the prompt block properties, the call is dropped when reaching it. I suspect it has something to do with the en-US.js file or the PromptSwitch.js.. Has anybody done something like this?
Thanks in advance!

Check your logs you will find the answer there
Also understand how the JS file works and how to adjust it to your language if not in English