Sunday (4th of November 2012) marks the end of Daylight Saving Time in the US, Canada, Bermuda, Bahamas, Hait, Turks and Caicos Islands and in parts of Mexico. The clock will be turned back by one hour. Check the country for more information: USA, Canada, Bermuda, Bahamas, Haiti, Turks- und Caicos Islands as well as Mexico.
After Sunday there is only one country left in 2012 that has not yet ended DST: Cuba changes back to regular time one week later on the 11th of November 2012.