Margashirsha Purnima (Margashira Pournami) is the full moon day in Margashirsha Month as per Hindu calendar. In 2012, Margashirsha Purnima date is December 28.
It marks the end of Margashirsha Month in North Indian Hindi calendars and brings the end of Margashira Shukla Paksha in Marathi, Gujarati, Telugu & Kannada calendars.
Margashirsha Purnima is also observed as Datta Jayanti. Lord Dattatreya Swamy, who is considered as an incarnation of Trimurthi (Shiva, Vishnu and Brahma) was first appeared on the earth on this day.
Annapurna Jayanti Puja is also observed on Margashirsha Purnima. Goddess Annapurna Mata is known as the Goddess of food and nutrition.