How and when did Sai Baba attain Nirvana, and what happened immediately after?

According to the provided text, Sai Baba attained Nirvana in the year nineteen hundred and eighteen. He chose the auspicious festival day of Vijayadashami, also known as Dussehra, to make the offering of his own body. Chapter 33 explains that what followed this event was the establishment of the Samadhi, his final resting place. This marked the end of his time in bodily form, though his presence continued to be felt by his devotees, as illustrated by the story of Narayanrao.