This year, the New Year was delayed by one second. This is called a leap second. Last time such a leap second was added to our calendar was only seven years ago. This is done in order to synchronise our normal calendar which is astronomically based & mean solar time. The normal civil time is kept by atomic clocks which are extremely precise.
The leap second can be positive or negative & can be adjusted on 30th June or 31st December mid night.
So I was expecting them to display 23:59:60 or something like that before it became 00:00:00 on TV. But I was disappointed as the clock went from 23:59:59 to 00:00:00 as usual.
I wonder whether they have at least corrected that second later on.
You can read about it further at,
Also there’s a freeware utility that can be downloaded to synchronise your PC with the atomic clock, Atomic Clock Sync.