When and how did Sai Baba attain Nirvana?

According to the provided text, Sai Baba attained Nirvana, his final departure, in the year nineteen hundred and eighteen. As Chapter 33 describes, he chose the auspicious festival day of Vijayadashami, also known as Dussehra, to make the offering of his own body. Following this event, his Samadhi, or final resting place, was established. This marked the transition from his bodily form, though his presence continued to be powerfully felt by his devotees.