On Shivaratri day devotees should take second bath in the evening before doing Shiva Puja or visiting temple. Shiva Puja should be done during night and devotees should break the fast next day after taking bath. Devotees should break the fast between sunrise and before the end of Chaturdashi Tithi to get maximum benefit of the Vrat. According to one contradictory opinion devotees should break the fast only when Chaturdashi Tithi gets over. But it is believed that both Shiva Puja and Parana (?????)i.e. breaking the fast should be done within Chaturdashi Tithi.
Shivaratri puja can be performed one time or four times during the night. The whole night duration can be divided into four to get four Prahar (?????) to perform Shiva Puja four times. Drikpanchang.comlists all four Prahar durations for staunch Shiva devotees who perform Shiva Pujan four times in the night. We also list Nishita time when Lord Shiva appeared on the Earth in the form of Linga and the time window to break the fast on next day.
Shivaratri is also spelled as Shivratri, Shivarathri and Sivaratri.