Baby Ishaan was born on the circled date. Counting his birth date as day 1, on which day and date is the 100th day of his life?

Day 100 is 99 days after 23 June. June has 7 more days (to 30 June), July 31 (38), August 31 (69), and 30 more reach 30 September (99). 99 = 14 weeks + 1 day: Saturday + 1 = Sunday. (Monday, 1 October adds 100 days.)