'Leap second' added for first time in three years

Midnight will come later tonight as for the first time in three years an extra second is added to the official time set by atomic clocks.

The "leap second" means the last minute of June will have 61 seconds in it.
Leap seconds - and leap years - are added as basic ways to keep the clock in sync with the Earth and its seasons.
However, there are concerns the extra second could cause problems for some computer systems because it has to be added manually.
Timekeepers are divided over whether to keep the additional unit of time - and the issue is set to be debated at a meeting later this year
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