GLOBAL time will stand still tonight, delaying midnight by a second.

An extra sliver of time - a "leap-second" - is being added to the world's clocks to adjust for the inaccuracy of the spinning Earth.

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The latest pause - the 26th - will occur at 23:59:59 co-ordinated universal time (UTC), which is an hour behind British Summer Time.

Computer programmers try to take account of leap seconds but many systems could be caught out, warns atomic clock expert Professor Judah Levine, from the US National Institute of Standards and Technology in Boulder, Colorado.