All vrats

Also called Pradosham, Pradosh Vrat, प्रदोष व्रत.

Pradosh vrat falls on the thirteenth tithi of both fortnights and is kept in the twilight after sunset, so it comes about twice a lunar month. The weekday gives it a second name: a Saturday one is Shani Pradosh, a Monday one Som Pradosh.

Dates and end times are IST, computed for Ujjain. The tithi ends at the same instant everywhere and only the clock reading changes with your timezone — though near midnight that can move the date itself. The app computes these for your city.