Vyaghra Dwadashi marks the beginning of Diwali celebrations in most parts of India. In 2017, Vyaghra Dwadashi date is October 16.
It is celebrated on 12th day in Krishna Paksha of Ashwin month or Ashwayuja masam in Marathi, Gujarati, Kannada, and Telugu calendars. It coincides with Krishna Paksha Dwadashi of Kartik Month in North Indian Hindi calendars.
Vyaghra Dwadashi is also celebrated as Guru Dwadashi. It marks the biggest celebrations in Sripada Sri Vallabha Kshetram in Pithapuram of Andhra Pradesh. It is celebrated for several days in Pithapuram Datta Kshetram.
Guru Dwadashi is also celebrated in grand manner at Gangapur Dattatreya Temple in Karnataka. The festival is celebrated for four days in the temple which marks the culmination on Deepavali. On Ashwin Krishna Chaturdasi day, thousands of devotees lead a procession for Ashta Theerthams. Some devotees start Gurucharitra Parayana on Sripada Vallabha Jayanthi and conclude on Guru Dwadashi day.