Can you explain the specific timing and date of Sai Baba's Mahasamadhi as described in Chapter 42?

According to Chapter 42, Sai Baba's body passed away during the day in the Shaka year 1840. The text specifies this occurred during the first month of the sun's southern transit (Dakshinayan), on the day of Vijayadashami in the bright half of the month (Shukla Paksha). Furthermore, this corresponded to the 9th date of the Muslim month, which was the night of 'Kattal' (the eve of Moharram). The chapter states that Sainath made preparations for his departure in the third watch of the day, with the bell striking around twelve-thirty.