It oftens feels like there are not enough hours in the day. But are there enough seconds?

The answer is no - according to the impressively named Earth Rotation and Reference Systems Service (IERS).

The IERS, which is responsible for keeping track of the gap between atomic seconds and planetary time will be adding an extra so-called 'leap second' to their atomic clocks this weekend.

On Saturday night, therefore, atomic clocks will read 23 hours, 59 minutes and 60 seconds, before moving onto Greenwich Mean Time at midnight.