We know that January's "Blue Monday" is the most depressing day of the year, but what about the happiest one?

According to Dr Cliff Arnall, a psychologist and lecturer at Cardiff University, today is the cheeriest day of the year (he worked it out it by applying the foruma O + (N x S) + Cpm/T + He, which you can find more about here).

Do you feel happy today – and if so, why? Is it the lovely weather? Could it be the thought of going for a pint after work? Or plans to eat strawberries and hike in the forest this weekend? Let us know what brings a smile to your face, and perhaps your happiness will become contagious.