"One year of 'Piku': 28 years of 'Khuda Gawah'," Amitabh posted.
'Piku' director Shoojit Sircar also took to Twitter to share the news.
He tweeted: "Celebrating one year of 'Piku'."
The film starred actors Deepika Padukone and Irrfan Khan as well.
Big B's 1992 romance-drama 'Khuda Gawah' also starred actress Sridevi.