Sure! Here is a harder riddle: Guess the date.
A pair of enemies, let's name them A and B, were captured in a room. The kidnapper gave them 10 dates: 16 May, 17 May, 19 May, 15 June, 18 June, 14 July, 16 July, 14 August, 15 August, and 17 August. The first one to guess the correct date among them within 10 minutes could escape. The kidnapper told A the correct month, and B the correct date, as he knew they would never tell each other.
A said in despair: "There is no way I can figure it out. Good news, I'm sure you can't". B suddenly rushed out. A paused, then stood up and shouted at the door: "I knew it!". But it was too late.
What was the correct date?
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