Yeah. I posted this on another such thread, but the date it is using is apparently the date the storm was declared a tropical depression. This isn't a reasonable interpretation, if you ask me. If you ask a human who was just hunkered down in a closet in FL trying to ride out Ian "how many days since the last Cat 4?" their answer is going to be "One."

6 days since it _started_.

But it wasn't a Cat 4 six days ago.

Shouldn't its existence be measured since it was named, rather than categorized?