Ekadashi is a sacred day, occuring twice a month in the Hindu calendar - on the eleventh day of the bright half - called Shukla Paksha and on the eleventh of the dark half called Vad or Krishna Paksha. It is observed as a fast day by many Hindus, especially for vaishnavites, whorshippers of Lord Vishnu. During Ekadashi, a waterless fast is ideal. However those unable to fast may take liquids, or if needed Phalhaari foods. When oberving a fast on ekadashi day as a result of a vow or wish, one must stay awake that night and worship Lord Vishnu, as well as fast.
Ekadashi Vrat Calendar 2019