Dreading the first Monday of the New Year? You're not alone.
Today could be the most depressing day of the year, a new study shows.
British company Upbeat analyses social media to gauge moods on any given day. Each day is given a score on its ‘happiness index’ from 0 to 100.
The first Monday back at work for the year consistently scored the lowest, reaching just 49 on the scale.
Tweets relating to guilt were nearly five times higher on the first working Monday than other days, as people head back to work and bemoan their inability to keep New Year's resolutions.
Previous research suggests 'Blue Monday' falls on the third Monday of January, but this day typically scores 67.
Key happiness index days:
December 24 and 25 - Christmas - 100
January 1 - New Years Day - 91
February 14 - Valentine's Day - 81 (mentions of love up by 187 per cent)