NEW YORK (CBSNewYork) — While Jets fans may disagree, one British psychologist theorizes that Monday, January 17, was the most depressing day of the year.

Psychologist Cliff Arnall has developed a complicated equation on happiness, and contends that the combination of dreary weather, debt from the holidays and broken New Year’s resolutions add up to make the third Monday of January the saddest day of 2011.

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The day has been deemed “Blue Monday,” and was a Twitter trending topic Monday morning.

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By a similar equation, the same psychologist finds June 17th will be the happiest day of the year.

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You tell us — do you agree?