"The Best Day of My Life" is the 998th episode of Casualty and the 37th episode of the 30th series. It was preceded by "This Life" and followed by "You Make Me Sick". The episode was directed by Julie Edwards and written by Ben Ayrton and Jeff Povey. This episode was an hour in length in comparison to the regular duration of 50 minutes, with the additional ten minutes worth of material being written by Sarah Beeson and directed by Steve Hughes.