Such a day was talked about 15 years ago. There was even a "scientific equation" created by Cliff Arnall, who was working at the University of Cardiff at the time. Blue Monday usually falls on the third Monday in January. His equation takes into account in the calculations indebtedness, unfulfilled New Year's resolutions and weather, to which is often added darkness and colds or colds. However, it later turned out that Cliff Arnall created the report based on a request from a travel agency, which in bad weather only tried to increase the number of tours sold. Cliff Arnall also did not last long at work, and the university itself distanced itself from its equation.