Here are the date and time of Purnima in August 2013. Full Moon or Purnima tithi in August 2013 is known as Shravan Purnima, Poornima in Shravan month. This Purnima is also celebrated as Rakshabandhan Festival.
August 20/21, 2013: Shravan Purnima
It begins at 10.19 AM on 20th August and ends at 7.11 AM on 21st August. It is also celebrated as Rakhi Purnima (Raksha bandhan festival) or Narali Purnima (Maha Shravani).
Shravan purnima is observed as Upakarma or Avani Avittam or Yagnopavitha Dhaarana (sacred thread ceremony) by the Brahmins in South India. Hayagriva Jayanti is also celebrated on this day.
Shravan Purnima marks the last day or the ending of Shravan month in North Indian Hindi calendars. Amarnath Yatra is concluded on this day.