I don't think any of us would know what dates you have to or you don't have to memorize.
I don't think I was asked any specific date questions (like, "when did Mendel do his experiments with peas?") but that doesn't mean I know for sure that ADEA won't ask this on the exam 🙄.
i took the exam on dec 21st. never had a question related to dates or the names of scientist. I, personally, think that there are far more better questions than just asking those questions. but of course, i cannot guarantee.