Amazon, in addition to selling stuff, is now in the time-shifting business. From 1200 today, 30th June, to 1200 on 1 July, the universal second, according to Amazon, will be slightly longer than seconds everywhere else. This is because of the need to add in a leap second at the end of June owing to the slowing of the earth's rotation. You can read much more about this on the Science Geek's informative blog.
It is to be hoped that this will not result in the earth's shifting on its axis, or purchases via Amazon's going astray. The first of these would be unfortunate; the second, cataclysmic.