Purnima, also known as Pournami or Poornima, is the full moon day in a traditional Hindu lunar calendar. In September 2011, the date of Purnima is October 11 and 12. The Purnima fasting is marked on October 11. The time of Poornima tithi is from 4:24 AM on October 11 to 6:27 AM on October 12. The Purnima in October 2011 is the Ashwin Purnima in most regions. In Tamil Calendar, it is the Purattassi Purnima.

October 11, 2011 is observed as Kojagari Lakshmi Purnima and Sharad Purnima.

Kartik Snan begins in North India on October 12, 2011.

Fasting and taking a dip in holy are the main religious practice for Hindus on the day.

Some Hindu communities observe fast on Purnima day. Special pujas and rituals are performed in many temples.