September 14Kumba Ial1752 Under the terms of the Calendar (New Style) Act 1750, the British Empire adopted the Gregorian calendar, skipping 11days of the month.1940 Hungarian forces massacred at least 150 ethnic Romanians in Ip, Transylvania, following rumors that Romanians were responsible for the deaths of two soldiers.1943 World War II: Nazi forces began a mass extermination campaign against the civilian residents of around 20 villages on the Greek island of Crete, eventually killing more than 500 men.2003 President Kumba Ial (pictured) of Guinea-Bissau was deposed in a bloodless military coup.2015 Physicists of the LIGO and Virgo projects first observed gravitational waves, the existence of which was predicted by Henri Poincar in 1905.ConstantineV (d.775)Jeremiah Dummer (b.1645)Ponnambalam Arunachalam (b.1853)Beah Richards (d.2000)More anniversaries: September 13September 14September 15ArchiveBy emailList of days of the yearAbout