Padmanabha Dwadashi or Ananta Padmabha Dwadasi vrata is dedicated to Lord Ananta Padmanabha swamy. In 2013, Padmanabha Dwadashi date is October 15.
Padmanabha Swamy is the none other than Lord Vishnu who blesses his devotees in the reclining posture on Aadiseshu (the divine Serpent).
It is observed on twelfth day in bright half of Ashwin Month or Ashwayuja masa (Ashwin Shukla paksha Dwadashi) which comes falls on the second day after Dasara (Vijaya Dashami).
Ananta Padmanabha swamy is mostly worshipped in South India. There are several famous temples of Padmanabha swamy in Andhra Pradesh and Kerala.
Ananthagiri Anantha Padmanabha swamy temple near Vikarabad in Andhra Pradesh and Padmanabhaswamy Temple in Thiruvananthapuram in Kerala are prominent temples of the Lord.
In some Hindu calendars, Ashwayuja Shukla Dwadashi is also mentioned as Govatsa Dwadashi or Godwadashi vratham.
Padmanabha Dwadasi 2012 date was October 26.