Vrat & Festival Calendar

How these dates are determined: Ekadashi (the 11th lunar day of each paksha) and Pradosh Vrat (the 13th) are widely observed fasting days in the Hindu calendar. Dates here follow the Smarta convention - the mainstream civil-calendar reckoning - by checking which day's tithi is active at a fixed reference hour (6 AM for Ekadashi, 6 PM for Pradosh); Vaishnava tradition can observe Ekadashi a day later in some months, so followers of that tradition should cross-check with their own source. Sankashti Chaturthi is not covered here as it's reckoned from moonrise, which isn't available from this page's data source.