Planning far ahead of time

I enjoy using the amadeus.net web site to find out about available flight connections. When I was looking for flights earlier this year, Amadeus got the dates wrong. I am sure that the date for the flight (February 19th, 2013) was correct, but the date they claimed I had chosen (January 10th, 2536) certainly was not. So, who is to blame: backend developers, web/UI developers, browser developers, testers?