E. Dwadashi, following the sun rises. It is actually of utmost worth that Ekadashi Parana is done around the Dwadashi tithi only, and specifically in the 1st quarter in the day, and that is also referred to as as Hari vasar This day is dedicated to worshipping Lord Vishnu. Prayers https://prxdirectory.com/listings13314647/ekadashi-for-dummies