Today is going to be great!

June 20, 2008 June 20 has been declared the Happiest Day of the year by a leading researcher at the University of Cardiff's Centre for Lifelong Learning.

Cliff Arnell has taken the credit for discovering today's hyper-happy potential after working out maths formula – O + (N xS) + Cpm/T + He.

He devised an elaborate scientific equation based on physical, emotional and stress factors that pointed to today as the optimum time for cheer and joy. Among the factors: It's the first day of summer - which means happy memories, more time to enjoy nature and the anticipation of holidays and vacations, reports the Telegraph.

O stands for being outdoors and outdoor activity, N is connection with nature, which is in full bloom now, S is socialisation with neighbours and friends, Cpm stands for childhood positive memories, T is the mean temperature which is now usually warm, and He is holiday expected.

Arnall, a psychologist and former tutor at Cardiff University, said that the main aim is to 'get people talking about what makes them happy.'

Arnall, who was commissioned by Walls Ice Cream to carry out the study, also calculates the most depressing day of the year which is normally around the end of January which is based on the weather, debt after Christmas, time since Christmas and motivational levels and days to pay day.