Purnima, or full moon day, in May 2011 is the Vaisakha Purnima in most regions. Purnima May 2011 date is May 17. The Purnima begins at 6:51 PM on May 16 and ends at 4:46 PM on May 17. The month long Vaisakh Snan ends on the day.
The day is also observed as Kurma Jayanti by some Hindu communities.
Some Hindu communities observe fast on the day.
The day is observed as Radha Raman Jayanti in Vrindavan.
In Tamil Calendars, this is the Pournami in Vaigasi Month.
The day is also the last day in the Vaishak month in the traditional Hindu calendar followed in North India.