In 2014, he received an honorary doctorate in performing arts from Merrimack, where he also delivered that year's keynote address.Besides playing Charlie Kelly on the hit FX television series It's Always Sunny in Philadelphia, he is also one of the show's executive producers and one of its writers, along with Rob Mc Elhenney and Glenn Howerton.

In 2013, he voiced a character named Art in the Pixar animated film Monsters University and appeared in Guillermo del Toro's film Pacific Rim.

Day is set to reprise his role for the Pacific Rim sequel.

Day has also been a producer for the television shows How to Be a Gentleman and Unsupervised.

Day hosted the November 5, 2011 episode of Saturday Night Live (SNL) with Maroon 5 as the musical guest.

He was the second cast member from It's Always Sunny in Philadelphia to host SNL (after Danny De Vito, though De Vito hosted SNL before It's Always Sunny in Philadelphia premiered).

De Vito made a special appearance during Day's opening monologue.

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His mother, Mary (née Peckham), was a piano teacher at The Pennfield School in Portsmouth, Rhode Island. Thomas Charles Day, is a retired professor of music history at Salve Regina University in Newport, Rhode Island.