I tried: "When is the first full moon after October the 18th 2021?" It should have said the 20th of October but it said: "November the 19th 2021". Big AI models

I tried: "When is the first full moon after October the 18th 2021?" It should have said the 20th of October but it said: "November the 19th 2021". Big AI models have quite a way to go I think...