Can you provide the specific details about the date and time of Sai Baba's passing as recorded in Chapter 42?

Certainly. Chapter 42 of the Sai Satcharitra provides a detailed account of Sai Baba leaving his body. The text states this event occurred in the Shaka year 1840, during the first month of the sun's southern transit (Dakshinayan). It was the day of Vijayadashami in the bright half of the month (Shukla Paksha). The chapter also notes that this corresponded to the 9th date of the Muslim month, which was the eve of Moharram ('Kattal'). Sainath made his preparations for departure during the third watch of the day, with his body passing away during the daytime after the bell struck twelve-thirty.