A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to correspond to the mean solar time. An adjustment of +1 second is scheduled for 23:59 UTC on the 30th June 2015.
This change will be carried out globally and simultaneously at the UTC scheduled time, adjust accordingly for your timezone. For example, the leap second change will take place at 19:59 in Eastern Standard Time.
Please see the attached document to determine which DCA/Cloud products are affected.