Expression: A week tomorrow

Hi

Could you please shed some light on the following sentence?

1- His new job starts a week tomorrow.

What does it really mean?

Tom

A week tomorrow means a week from tomorrow. Another way of saying this is: tomorrow week.

A week on Tuesday/Tuesday week, a week from Tuesday.
A week from now, this day next week.
Yesterday week, a week ago yesterday.
A week last Sunday, one week before last Sunday.

Also, ‘Tuesday fortnight’. (BrE?)