Can you provide the specific details from Chapter 42 about the date and time of Sai Baba's Mahasamadhi?

Certainly. Chapter 42 provides a very precise account of when Sai Baba left his body. The event took place in the Shaka year 1840, during the first month of the sun's southern transit (Dakshinayan). The specific day was Vijayadashami, which falls in the bright half of the month (Shukla Paksha). The chapter cross-references this with the Muslim calendar, noting it was the 9th day of the month, corresponding to the eve of Moharram. As for the time, Chapter 42 states that Sainath made his departure during the third watch of the day, when the bell struck around twelve-thirty in the afternoon.