Mahādvādaśī marks special Dvādaśī rules (e.g. Unmīlanī, Vyañjulī) that can shift how Ekādaśī is observed. On the Panchang the civil date follows special Dvādaśī rules can move which civil day is kept as Ekādaśī — follow your school. Because tithi and nakṣatra boundaries are reckoned from local sunrise, the same observance can fall a day earlier or later in another city. Pakṣavardhinī Mahādvādaśī — the tithi rule associated with an extended Pūrṇimā or Amāvāsyā at the fortnight's end. Follow your Ekādaśī school (Smārta / Vaiṣṇava) to choose which civil day to observe. Dates below for 2027 are computed from sunrise at your selected place. The same vrata can fall on an adjacent civil day in another city.
