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Every now and then a leap second is added to Coordinated Universal Time (UTC) in order to synchronize atomic clocks with the Earth's ever slowing rotation. The previous leap second was added on June 30, 2015 at 23:59:60 UTC. The difference between UTC and International Atomic Time (UTC-TAI) is now 36 seconds. We use systems to perform simulations and experiments which critically depend on time measurements, therefore we had to adjust our internal time to match the corrected UTC time. Instead of just adding 1 second on June, 30th, we proceeded to add some milliseconds quite in advance in order to catch up with the new UTC here. The timer was a reference for our technicians to perform this activity in an orderly manner.
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