I installed the AVS SDK and I played with the SampleApp using the AlexaClientSDKConfig.json file. I ran some tests by asking for instance: how many days before Cinco de Mayo? And the answer was, "It's in 44 days on Tuesday, May 5th 2020"; which is correct. Same with Thanksgiving and other holidays.
However, if I ask, How many days before Christmas? Then the answer is: "Christmas is in 2104 days on Thursday Dec 25th in 2025."
Is this a bug?