Invalid EndDate. For help, see http://sellercentral.amazon.co.uk/gp/help/25061
This error occurs when the end date for your sale is outside of the currently accepted range. Dates must fall on or between January 1, 1970 (1970-01-01) and January 18, 2038 (2038-01-18). To correct this error, please resubmit your inventory file or pricing feed (XML) with a properly formatted date that falls within the valid date range.