Napoleon returned to Paris and found that both the legislature and the people had turned against him. Realizing his position was untenable, he abdicated on 22 June in favour of his son. He left Paris three days later and settled at Josephine's former palace in Malmaison (on the western bank of the Seine about 17 kilometres (11 mi) west of Paris). Even as Napoleon travelled to Paris, the Coalition forces crossed the frontier swept through France (arriving in the vicinity of Paris on 29 June), with the stated intent on restoring Louis XVIII to the French throne.
Try to answer this question if possible (otherwise reply "unanswerable"):  On what date did Napoleon abdicate?
22 June