This is the BBC home video version as released in the mid 80's in the UK and is the movie length version, not the original 4 part episode as broadcasted.
Additional Information by videopticon
This is the first of only two Doctor Who titles on NTSC LD, the other being "The Five Doctors". The jacket notes go to the trouble of briefly describing the Daleks backstory and their popularity as recurring villains. The disc labels and the program title sequence agree that the episode is named "Day of the Daleks", yet the jacket's face and spine insist on plunking an extra "The" up front.
Side 2 program content runs just over 29 minutes, meaning it could easily have been pressed as a CAV side. Instead, two unlisted chapters are devoted to the Chace surround test sequence, utterly useless on a mono program, and a stretch of bars & tone.