Today, 20, 21 August 2013 is Purnima, Shravan Purnima, Rakhi Purnima, Rakshabandhan, Kajri Purnima Vrat. It is the Full Moon day in Shravan Month as per Hindu calendar.
In Tamil Nadu, it is celebrated as Avani Pournami (Avani Month Purnima), and in Malayalam calendar of Kerala, it is Chingam Velthuvavu (Chinga Month Purnima). According to Bengali Panjika, this Pournami is Bhadra Purnima.
Purnima begins at 10.19 AM on 20th August and ends at 7.11 AM on 21st August 2013. As Purnima tithi prevails during the Sunrise on 21st August, this day is also considered as Purnima.
According to North Indian Hindi calendars, this purnima marks the end of Shravan Month. It marks the end of Shukla Paksha in Shravan Month as per Amavasyant Panchangams followed in Andhra Pradesh, Karnataka, Maharashtra and Gujarat.
Shravan Purnima is also observed as Upakarma (Yajurveda Upakarma and Rigveda Upakarma), Yagnopavitha Dharana, Jandhyala Purnima, Janeyu Pournami, which marks the day of wearing new sacred thread (Yagnopavitha).