Adhika masa or Adhik month in 2012 is Adhik Bhadrapada masa. It is an extra month for those who follow Chandramana Panchangam or lunar calendar. In 2012, Adhika masa Ekadashi are known as Padmini Ekadashi (Kamala Ekadasi) and Parama Ekadasi (Kamala Ekadashi).
Here are the Ekadashi dates in Adhika masa 2012:
Padmini Ekadasi (Kamala Ekadasi): August 27, 2012
Parama Ekadasi (Kamala Ekadasi): September 12, 2012
It is to note that Smarta sect of people observes Ekadashi vrat and fasting during the day it begins and Vaishnava sect of people observe the vrat when it ends. These Ekadashi dates are given as per Telugu, Kannada, Marathi, and Gujarati calendars. In North India, Adhik masa ends on August 31, 2012 .