Some mental health charities are debunking the theory about today being branded as the most depressing day of the year.

"Blue Monday" was originally created as a marketing ploy in 2005, to encourage people to book holidays on the 'most difficult day of the year'.

Those behind the claim said they'd taken into account various factors - such as the time since Christmas, time since last payday, weather and other factors.

However, many experts have since suggested the original equation was based on pseudoscience.

A number of groups are today pointing out that depression can strike at any time of the year.

On the subject of Blue Monday itself, the Mental Health Foundation explains: "Research shows that it’s not the actual day that gets people down and makes them feel gloomy but simply the shorter days and less sunlight we have in January and throughout the winter months."

It offers various tips for anyone feeling low - such as exercising, eating well, being sociable, setting realistic goals, or joining a hobby group.

A number of mental health groups are also operating for anyone who feels like they need professional support.

The Samaritans charity, meanwhile, is today urging people to get together with friends, family or work colleagues for a cup of tea or coffee and a chat - making the day Brew Monday instead of Blue Monday.

Cindy O’Shea, Samaritans Irish Regional Director, explained: “Days like Brew Monday can help raise awareness of loneliness as a national issue.

“Reaching out to someone you know like a friend, relative or colleague, who you suspect may be suffering in silence, could make a huge different to their life."

Anyone looking for support can contact Samaritans for free any time from any phone on 116 123.

They can also text 087 260 9090, email jo@samaritans.ie or visit www.samaritans.ie.