E. Dwadashi, after the Sunshine rises. It can be of utmost importance that Ekadashi Parana is carried out within the Dwadashi tithi only, and specially in the main quarter of the day, which can be also referred to as as Hari vasar This day is dedicated to worshipping Lord Vishnu. https://directoryserp.com/listings13323438/the-smart-trick-of-ekadashi-that-no-one-is-discussing