A British psychologist has devised a mathematical formula for computing the most depressing day of the year:
[W + (D-d)] x TQ
M x NA
See the above link for an explanation of the variables, but according to this formula, the most depressing day of the year is January 24, which happens to be today.
Does this oversimplify the complexities of real life? Probably.
And yet I do feel pretty crummy today . . .