<P> Blue Monday is a name given to a day in January (typically the third Monday of the month) claimed to be the most depressing day of the year . The concept was first publicised as part of a 2005 press release from holiday company Sky Travel, which claimed to have calculated the date using an equation . </P> <P> The idea is considered pseudoscience, with its formula derided by scientists as nonsensical . </P> <P> This date was published in a press release under the name of Cliff Arnall, at the time a tutor at the Centre for Lifelong Learning, a Further Education centre attached to Cardiff University . Guardian columnist Ben Goldacre reported that the press release was delivered substantially pre-written to a number of academics by public relations agency Porter Novelli, who offered them money to put their names to it . The Guardian later printed a statement from Cardiff University distancing themselves from Arnall: "Cardiff University has asked us to point out that Cliff Arnall...was a former part - time tutor at the university but left in February ." </P> <P> Variations of the story have been repeatedly reused by other companies in press releases, with 2014 seeing Blue Monday invoked by legal firms and retailers of bottled water and alcoholic drinks . Some versions of the story purport to analyse trends in social media posts to calculate the date . </P>

Where does the saying blue monday come from