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Monday, May 18, 2015

Equity Technical Update #2015 - 6
Information Regarding June 30, 2015 Leap Second Impact

Category:

  • Industry Announcement
  • System Impact

Markets Impacted:

Contact Information:

Resources:

Nasdaq utilizes industry-standard time synchronization systems that rely on atomic time sources to maintain accuracy. Effective Tuesday, June 30, 2015, a leap second will be added after 19:59:59 ET (23:59:59 UTC). A leap second is an extra 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.

To minimize any potential impacts this may have on external systems, Nasdaq, in conjunction with other UTP participants, has made the decision to implement an early close for those systems which would normally close at 20:00 ET, June 30th (00:00 UTC , July 1st). On June 30, 2015, the following systems will be closing at 19:30 ET (23:30 UTC):

  • The Nasdaq Stock Market
  • FINRA/Nasdaq Trade Reporting Facility (ACT System)

All other Nasdaq U.S. equities markets will operate on normal operating schedule on June 30, 2015. For more information on Nasdaq’s normal hours of operation, please visit the Market System Hours page.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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