2024 Krishna Janmashtami
Devotees, who observe fast on Janmashtami, should have the only single meal a day before Janmashtami. On fasting day, devotees take Sankalpa to observe a day-long fast and to break it on the next day when both Rohini Nakshatra and Ashtami Tithi are over. Some devotees break the fast when either Rohini Nakshatra or Ashtami Tithi is over. Sankalpa is taken after finishing morning rituals and the day-long fasting begins with Sankalpa.
The time to perform Krishna Puja is during Nishita Kaal which is the midnight as per Vedic time-keeping. Devotees perform detailed ritualistic Puja during midnight and it involves all sixteen steps which are part of Shodashopachara Puja Vidhi. Please check Krishna Janmashtami Puja Vidhi which lists all Puja steps for Janmashtami along with Vedic Mantra to perform the Puja.