Today, 18 March 2012 is Ekadasi Vrat. It is Papamochani Ekadasi (Papavimochani Ekadashi). It falls in Krishna Paksha of Chaitra Month as per North Indian Hindi calendars. It coincides with Krishna Paksha ekadashi in Falgun Month in Marathi, Gujarati, Kannada & Telugu Calendars.
Papamochani Ekadasi Vrat Katha or the story of this Ekadasi is mentioned in the Bhavishya Uttara Purana as a conversation between Lord Krishna and King Dharmaraja.
It falls in Panguni Masam in Tamil Calendar & Meena Masam in Malayalam Calendar.