The Wayback Machine - https://web.archive.org/web/20150505061854/https://www.theice.com/leap-second

ICE utilizes industry-standard time synchronization systems that rely on atomic time sources to maintain accuracy. On June 30th of this year, a leap second will be added after 23:59:59 GMT. A leap second is a second which is added to Coordinated Universal Time (UTC)/Greenwich Mean Time (GMT), in order to synchronize atomic clocks with astronomical time to keep clocks as accurate as possible. This means that on the evening of June 30th, 2015 clocks will advance in the following manner - 23:59:59, 23:59:60, 00:00:00.

ICE is confident that this will not cause any issues on our systems; however, we cannot guarantee the same for all systems used by our participants, market data vendors, and other third-parties. As a result, ICE has made the decision to delay all market state transitions which would normally occur between June 30th 23:00 GMT and July 1st 00:01 GMT. These markets will instead transition according to the schedule below:

Standard Market Transition Times June 30th/July 1st Adjusted Market Transition Times
GMT ET GMT ET
Exchange Market Pre-Open Open Pre-Open Open Pre-Open Open Pre-Open Open
ICE Futures U.S. Sugar 11 00:00 07:30 20:00 03:30 00:05 07:30 20:05 03:30
Coffee C 00:00 08:15 20:00 04:15 00:05 08:15 20:05 04:15
Cocoa 00:00 08:45 20:00 04:45 00:05 08:45 20:05 04:45
Cotton No 2 23:30 01:00 19:30 21:00 00:05 01:00 20:05 21:00
FCOJ A 00:00 12:00 20:00 08:00 00:05 12:00 20:05 08:00
Metals 23:30 00:00 19:30 20:00 00:05 00:10 20:05 20:10
Equity Indices 23:30 00:00 19:30 20:00 00:05 00:10 20:05 20:10
U.S. Dollar Index 23:30 00:00 19:30 20:00 00:05 00:10 20:05 20:10
FX 23:30 00:00 19:30 20:00 00:05 00:10 20:05 20:10
Corn 23:30 00:00 19:30 20:00 00:05 00:10 20:05 20:10
Soybean 23:30 00:00 19:30 20:00 00:05 00:10 20:05 20:10
Wheat 23:30 00:00 19:30 20:00 00:05 00:10 20:05 20:10
ICE Futures U.S. -
Energy Division
Canadian Fin Gas 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Fin Gas 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Fin Power 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Henry 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Physical Environmental 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Financial Environmental 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Standard Market Transition Times June 30th/July 1st Adjusted Market Transition Times
GMT ET GMT ET
Exchange Market Pre-Open Open Pre-Open Open Pre-Open Open Pre-Open Open
ICE Futures Europe Eurodollar 23:30 23:45 19:30 19:45 00:05 00:10 20:05 20:10
GCF Repo 23:30 23:45 19:30 19:45 00:05 00:10 20:05 20:10
Ferrous Metals 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Fin LNG 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Fin Monomores 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Fin NGL 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Fin Olefins 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Oil 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Freight 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Euribor 23:45 00:00 19:45 20:00 00:05 00:10 20:05 20:10
MSCI Europe NTR Index Futures 23:45 00:00 19:45 20:00 00:05 00:10 20:05 20:10
MSCI World NTR Index Futures 23:45 00:00 19:45 20:00 00:05 00:10 20:05 20:10
Brent 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Brent NX/WTI Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Brent/MEC Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Brent/WTI Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
BrentNX/Brent Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
CFR South China Coal Futures 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
FOB Indo sub-bit Coal Futures 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Gasoil 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
gC Newcastle Coal 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
gC Newcastle/FOB Indo sub-bit Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
GO Crack 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Heating Oil 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Heating Oil/Brent Crack 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Heating Oil/Brent NX Crack 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Heating Oil/LS GO Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
HO/WTI Crack 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
LS GO/Brent Crack 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Middle East Crude 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
RBOB 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
RBOB/Brent Crack 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
RBOB/Brent NX Crack 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
RBOB/HO Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
RBOB/LS GO Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
RBOB/WTI 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
US Coal 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
WTI 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
WTI/MEC Spread 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Standard Market Transition Times June 30th/July 1st Adjusted Market Transition Times
GMT ET GMT ET
Exchange Market Pre-Open Open Pre-Open Open Pre-Open Open Pre-Open Open
ICE Futures Singapore
Mini Brent Futures 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Kilo Gold Futures 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
Renminbi Futures 23:55 00:00 19:55 20:00 00:05 00:10 20:05 20:10
ICE Swap Trade
Fin Gas 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Fin Power 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10
Oil 23:40 23:50 19:40 19:50 00:05 00:10 20:05 20:10