Claim: Raksha Bandhan, also called Rakhi Pournima, is religiously observed by Hindus every Purnima (full moon) of Shrawan (the fourth day in the Bikram Sambat).
Evidence: Shrawan (Nepali: श्रावन or श्रावण) also known as Saaun (Nepali: साउन) is the fourth month in the Bikram Sambat, the official Nepali calendar.