January 24 is the most depressing day of the year, experts announced.

The scientists, who have derived a special formula to calculate the most depressing day, have also warned people not to take it personally if friends, family and colleagues seem particularly grumpy on that day.

A combination of poor weather, personal debt and failed attempts to stick to New Year's resolutions are likely to get too much for everyone on January 24.

Dr Cliff Arnall, of Cardiff University, came up with the date using a formula to illustrate the various emotional factors at play. The formula that takes into account six factors likely to have an emotional impact at this time of the year. These include the weather, debt (minus the amount of money to be paid on your next pay day) and the time since Christmas.

Then there is the time since a failed attempt to quit a bad habit along with general motivational levels and the need to take action to have something to look forward to.

Dr Arnall said the formula results could vary between individuals. But he believed January 24 would work out as the lowest point for many.

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