What was the date of the storming of the Bastille?

Never. First of all, the people who stormed the Bastille were not peasants, but townsfolk - the people of Paris. Secondly, although the Bastille had been used as a prison, that's not why it was stormed. It was also a defence work and a gunpowder store, and the Parisians wanted the gunpowder. They made a bit of Propaganda fuss about releasing prisoners, but they only found seven of them. Those corrections made, it happened on July 14, 1789.