Passing full date via Service Items

Hi,

I am trying to create an automation which forwards the parameters of a service catalogue item to a script I am running.

I am trying to use the date picker, and then pass the full date to my script:

Unfortunately, all that is passed is the day and the date of the month:

I am using a workflow automation with Powershell - Orch:
 

Am I missing something, or is there no way to pass the month + year when using the date picker?

Many thanks,

Alex