Ekadashi fasting or Ekadasi vrata is an auspicious Vishnu puja observed on every eleventh day in both fortnights of a Hindu month. Ekadasi July 2017 dates are – July 4, July 19 & July 20 (Devshayani Ekadashi & Smarta Kamika Ekadashi; Bhagvat Kamini Ekadashi).
Devshayani Ekadashi falls (July 4, 2017) in Shukla Paksha of Ashada Month as per all Hindu lunar calendars followed in North India, Maharashtra, Gujarat, Telangana, Andhra Pradesh and Karnataka. It is also known as Ashadi Ekadashi, Harishayana Ekadashi, etc..
It falls in Aani masam of Tamil calendar, Mithunam Month of Malayalam calendar, Ashar Month of Bengali Panjika.
Kamika Ekadashi falls (July 19 / July 20, 2017 in Krishna Paksha of Shravan Month as per all North Indian Hindu lunar calendars and in Ashada Month as per calendars followed in Maharashtra, Gujarat, Telangana, Andhra Pradesh and Karnataka.
It falls in Aadi masam of Tamil calendar, Karkidakam month of Malayalam calendar, Shraban Month of Bengali Panjika.