Ekadashi fasting or Ekadasi vrata is an auspicious Vishnu puja observed on every eleventh day in both fortnights of a Hindu month. Ekadasi July 2012 dates are – July 14 & July 29 (Kamika Ekadasi vrat & Pavitra Ekadashi).
Kamika Ekadasi falls (July 14, 2012) in Krishna Paksha of Ashada month as per Telugu, Kannada, Marathi, and Gujarati calendars. And it falls in Krishna Paksha of Shravan month in North Indian Hindi panchangas.
Pavitra Ekadasi falls (July 29, 2012) in Shukla Paksha of Shravan Month as per all Hindu lunar calendars followed in North India, Maharashtra, Gujarat, Andhra Pradesh and Karnataka. It is also known as Pavitropana Ekadasi and Putrada Ekadasi..
This period coincides with Aani Masam and Aadi Masam as per Tamil calendar; Midhunam month and Karkidakam Masam in Malayalam calendar.