While a slew of activities is being planned for the day, with a special trailer being launched yesterday and an animated DDLJ promo being released today.
Shahrukh Khan himself shared the link on his Twitter page.
Yesterday Shahrukh took to Twitter to announce the launch of the new trailer, "My favourite line in a film ever... 'Nahin main nahi aaoonga....' DDLJ (ver 2.0 trailer reloaded)...I am so happy."
A statement from the movie's production banner Yash Raj Films (YRF) read: "Starting Dec 12, 2014, YRF is looking at a slew of activities to commemorate the completion of 1,000 weeks of DDLJ's uninterrupted run at the box office. The film released Oct 20, 1995, and ever since has been playing out in the iconic Maratha Mandir, making it the longest running film in the history of Indian cinema."
As part of the celebrations, SRK and Kajol, who were last seen together in My Name Is Khan, will appear on the television show Comedy Nights With Kapil to celebrate the occasion.
The film won 10 Filmfare Awards, including the awards for the best film, best actor, best actress, best director, at the 1996 edition of the ceremony. Watch the animated promo of DDLJ here...