To determine the date 90 days from March 18th, 2024, we need to add 90 days to the starting date. March has 31 days, so from March 18th to March 31st, there are 13 days. This leaves 77 days. April has 30 days, leaving 47 days. May has 31 days, leaving 16 days. Therefore, the date 90 days from March 18th, 2024 is June 16th, 2024.