Pandava Nirjala Ekadasi or Bhimsen Ekadashi or Pandav Ekadasi is observed in Shukla Paksha of Jyeshta Month. In 2011, Pandava Nirjala Ekadasi date is 12 June, today, Sunday. The importance or the vrat katha of Nirjala Ekadashi is mentioned in the Brahma Vaivarta Purana.
Most of the devotees observe Nirjala Ekadasi fasting without taking even water. On 12 June 2011, Champak Dwadasi is also observed. It is believed that Jagadguru Adi Shankara attained salvation on Champak Dwadasi day (Adi Sankara Kailasa Gamanam).