Leap seconds always happen late on Jun 30th, or December 31st - if they are needed. The reason why it is 'interesting' this time for computers, and haven't been an issue in the past, is that the last leap second in June was 2012 - but that was on a weekend. Before that, the most recent extra second in June was 1997, and before apparently everything was connected up and online. So, it was never a problem before.
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