Cheryl Again!

Level pending

Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates as shown :

Cheryl then tells Albert and Bernard separately the month and the day of her birthday respectively.

Albert: I don't know when Cheryl's birthday is, but I know that Bernard doesn't know too.

Bernard: At first I don't know when Cheryl's birthday is, but now I know.

Albert: Then I also know when Cheryl's birthday is.

When is Cheryl's birthday ?

source: Science Alert

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