Blue Monday is the third Monday in January
Blue Monday identifies the most depressed day of the year: the third Monday in January. Blue Monday is a discovery of the English psychologist Cliff Arnall. A few years ago he invented a scientific formula that showed that the third Monday in January is the day when most people feel sad, dejected or wistfully (debts of Christmas shopping, bad weather, not getting good Intentions, etc.).
Professor of RUG: "Blue Monday is crap" [YouTube] 7yfBdouIMxU [/youtube]