USA, Canada clocks on Daylight Saving Time until Sunday 3 November 2013 at 2am
local time
UK / Europe: Clocks on Summer Time until Sunday 27 October 2013 at 01:00 (1am) GMT
NIST scientists have built a second "quantum logic clock," using quantum
information processing techniques on a single ion of aluminium to make a clock
that would not gain or lose more than one second in about 3.7 billion years.