03/28/2008 02:43 am ET Updated May 25, 2011

Jan. 23, The Unhappiest Day Of The Year...

Watch out: Monday, January 23 is going to be the unhappiest day of the year, according to a British university researcher.

Cliff Arnall, a health psychologist at the University of Cardiff, specialising in confidence-building and stress management, told AFP the prediction was the result of some gruelling mathematics.

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