It’s a leap year

“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.”

http://www.telegraph.co.uk/business/2016/02/23/leap-year-why-february-29-should-be-a-bank-holiday/