The post you quoted is correct.
If using a count date calculator
eg
"90 days from Aug 23, 2023
Want to figure out the date that is exactly ninety days from Aug 23, 2023 without counting?
Your starting date is August 23, 2023 so that means that 90 days later would be November 21, 2023"...
I selected Aug 23 as it was my most recent 90 report in person.
My receipt is not Nov 21.
it's actually Nov 22.
Seems count date starts day after application.
90 days from Aug 23, 2023
Want to figure out the date that is exactly ninety days from Aug 23, 2023 without counting?
Your starting date is August 23, 2023 so that means that 90 days later would be November 21, 2023.