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.

READ MORE: Summit One Vanderbilt Offers Visitors A Unique View Of NYC From An All-Glass Elevator

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

READ MORE: NYPD Officers Rescue Man Who Fell Onto Subway Tracks In Manhattan

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

MORE NEWS: Returnships: Corporate Programs Aimed At People Who Have Been Out Of Work Are Presenting Employment Opportunities

You tell us — do you agree?