Since years we get queries related to Ekadashi fasting across the globe. Although, for someone born in religious Hindu family, such queries might look basic but there are Lord Vishnu devotees who get confused with basic Ekadashi timings given on Drik Panchang to observe Ekadashi Vrat.
These are Tithi timings given in Panchang (just similar to weekdays Sunday, Monday, etc. which begins at midnight and ends at next midnight) and help to decide the correct date to observe Ekadashi fasting. As Ekadashi Tithi might begin at any time of the day and mostly split over two days, on the basis of these timings one day is preferred over the other to observe fasting. Once you have fasting date you don't need them and we list them just for information. These timings are not needed to observe fasting.
No. As we mentioned above Tithi begin time is not needed for Ekadashi fasting. Ekadashi fasting always begins with Sunrise and mostly ends after next day Sunrise. Ekadashi is usually 24 hours fasting observed form local Sunrise to next Sunrise.
Having said that, it is also important to mention that devotees skip dinner made of all sorts of grains on previous night to avoid any residual food/grain in stomach when they begin fasting with Sunrise. In other words some devotees begin Ekadashi fast with sunset on previous day as per their devotion to Lord Vishnu.
When we list two dates for Ekadashi, to keep it simple, you take the first date and observe the fast for single day. First date is preferred over the second date when you decide to keep the fast for single day only. It is quite normal to have single day fasting even it is listed for two consecutive dates. If one has stamina, one can keep the fast for two days.
You begin the fast with local Sunrise which continues to next Sunrise. However fast is not always broken with next Sunrise. To get the full credit of fasting, Ekadashi fast is broken at an appropriate time after next day Sunrise which might prolong the fasting up to afternoon and beyond. Hence one can notice that for few fasting Parana time (i.e. time to break the fast) on next day is during lunch time.
Hari Vasara time is prohibited to break Ekadashi fast. If one cannot continue fasting till noon or in case of urgency one can break the fast, after Hari Vasara ends. However more appropriate time is after few hours of Hari Vasara end time.