It happened on a… August 23

2011
Libyan leader Muammar Gaddafi is overthrown after the National Transitional Council forces take control of Bab al-Azizia compound during the 2011 Libyan civil war.
2007
Hashtag invented and first used in a tweet by US product designer Chris Messina.
1943
Trans Canada Airlines starts transatlantic service; now Air Canada.
1904
Hard D. Weed patented the grip-tread tire chain for cars.
1839
British capture Hong Kong from China.
1667
Habitants of New France required to give 1/26 of their harvest to their seigneur (le dîme).