According to an old charity press release today is the most depressing day of the year, and it’s all down to the weather. The formula used to work out this date is a little wobbly on details but looks like:
![\frac{[W + (D-d)] \times T^Q}{M \times N_a}](http://upload.wikimedia.org/math/1/d/a/1da90efee88e1a738833621cba3b84ff.png)
where weather=W, debt=d, time since Christmas=T, time since failing our new year’s resolutions=Q, low motivational levels=M and the feeling of a need to take action=Na. ‘D’ is not defined in the release, nor are units.
This date allegedly falls on the fourth Monday of January. The date was declared by Arnall to be 24 January in 2005, 23 January in 2006, 22 January in 2007, 21 January in 2008, 19 January in 2009, 18 January in 2010 and 24 January in 2011.
(Source: Wikipedia)
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