We're aware we can get the month and year, but with this solution we lack the specific date. What we need on a 'Fixed End Date' product is DD/MM/YYYY in its entirety, but I believe at present you can't provide this to a specific date level.
As such could this be logged as a request to be considered as part of future development work please? To add in the 'Fixed End Date' field so this is passed to us in the API, with no requirement for calculation.