Assessing the economic impact of a leap year is tricky. In the UK, the Office for National Statistics adjusts GDP to make all Februaries comparable, so February is considered to be 28 and a quarter days long every year, regardless of whether it’s a leap year or not.

In the US, the presidential election always falls in a leap year, which makes it hard to isolate the causes of any economic bumps.

But one thing is obvious – every leap year there’s one extra day and no extra pay.

Salaried workers, who earn a set amount every month or year regardless of output or hours worked, are expected to put in an extra day at the office for the same amount of money.