Date Differences
Smarta and Vaishnava Ekadashi
Smarta and Vaishnava calendars can choose different fasting dates when tithi and sunrise conditions require separate observance rules.
Location-aware calculation
Resolving your location…
Next Ekadashi tradition details
Calculating dates for your city. Ekadashi depends on local sunrise, so this is worked out per location.
Why two calendars may disagree
Ekadashi is a vrat date, not just an astronomical tithi label. A calendar has to decide which civil day should be used for fasting after checking the tithi at local sunrise, whether Ekadashi is contaminated by Dashami, whether Dwadashi remains available for Parana, and the tradition's rule set.
Local sunrise
The same tithi can fall differently around sunrise in different cities.
Dwadashi availability
Parana needs a valid Dwadashi window, which can shift the recommended fast.
Tradition rules
Smarta-first public display can still show Vaishnava/ISKCON alternates where the API returns them.