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Generally it's seen that ekadashi or any other date for that purpose falls on two days. Normally Smartha observe say,ekadashi one day earlier than Vaishnavas. Most calendars only show Smartha dates but some show both. For instance my local calendar has two days for Janamashtmi,11 august for Smarthas and 12 august for Vaishnavas . This distinction is very acutely observed in North India even though Hindus there are not much sectarian other wise.
Why is it so?
The difference in tithis(dates) is due to the difference between Vaishnavas and Smarthas. Even this year Janamashtmi is being celebrated on two separate days. Some celebrated it on 11 august while others are celebrating it today i.e 12 august.
This difference is further explained in this video(in hindi). Basically, Smarthas consider the tithi from its orignal time while Vaishnavas consider the tithi from Brahma Muhurat in morning. So if the ekadashi falls on afternoon Smarthas consider it as ekadashi while next morning is considered ekadashi by Vaishnavas. That's why this year(2020) Smarthas celebrated Janamashtmi on 11 august when Asthami started at that time,while Vaishnavas are celebrating Janamastmi today,12 august since Ashtami was the tithi on Brahma Muhurat today morning.
