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On June 30. 2015 at midnight (UTC) a leap second will be added to adjust to the earth rotation The last adjustment was in 2012. z/VSE does not have STP (Server Time Protocol) support, and therefore it does not recognize leap seconds. My blog entry on STP holds a link to the IBM Redbook "STP planning guide". The blog entry is here . The relevant Redbook section to leap seconds is "Operating systems with no STP support". There is also a related older technical flash to this topic - here .