I made a mistake in an email to the new HR person, which was essentially telling her she made a mistake.
I caught it on review the next day.
I sent a followup:

Hi {{HR PERSON}}.

> Note: The start date cannot be correct, it says Monday, October 2, but
> October 2 is a Sunday.

Ahh, my first silly mistake . I was looking at a 2005 calendar.
Upon review I see you are right, of course.

Humbled,
{{ME}}