Hours which are past midnight are suffixed with next day date. In Panchang day starts and ends with sunrise.
The Krishna Paksha Ekadashi which comes after Kartik Purnima is known as Utpanna Ekadashi. It is the next Ekadashi after Devutthana Ekadashi.
Utpanna Ekadashi is one of the significant Ekadashis as it is associated with the origin of Ekadashi fasting. All Ekadashi fasting are dedicated to Goddess Ekadashi who is one of the Shaktis of Lord Vishnu. Ekadashi was born out of Lord Vishnu to annihilate Demon Mur who intended to kill sleeping Lord Vishnu. Hence Goddess Ekadashi is one of the protective powers of Lord Vishnu. Goddess Vaishnavi is another power of Lord Vishnu and part of Sapta Matrika.
Hence Utpanna Ekadashi is considered the birth anniversary of Ekadashi. Devotees, who pledge to observe yearly fasting, begin Ekadashi fasting from Utpanna Ekadashi.
Parana means breaking the fast. Ekadashi Parana is done after sunrise on next day of Ekadashi fast. It is necessary to do Parana within Dwadashi Tithi unless Dwadashi is over before sunrise. Not doing Parana within Dwadashi is similar to an offence.
Parana should not be done during Hari Vasara. One should wait for Hari Vasara to get over before breaking the fast. Hari Vasara is first one fourth duration of Dwadashi Tithi. The most preferred time to break the fast is Pratahkal. One should avoid breaking the fast during Madhyahna. If due to some reasons one is not able to break the fast during Pratahkal then one should do it after Madhyahna.
At times Ekadashi fasting is suggested on two consecutive days. It is advised that Smartha with family should observe fasting on first day only. The alternate Ekadashi fasting, which is the second one, is suggested for Sanyasis, widows and for those who want Moksha. When alternate Ekadashi fasting is suggested for Smartha it coincides with Vaishnava Ekadashi fasting day.
Ekadashi fasting on both days is suggested for staunch devotees who seek for love and affection of Lord Vishnu.