Days/dates

AP does not use the words “yesterday,” “today” or “tomorrow” or related words or phrases. Instead, it follows this rule: If the reference is to an event within one week before or after the day of publication, use the day of the week: Monday, Tuesday. If the reference is to an even further in the past or future, use the date: May 1. Do not use both the day and date at the same time.

Textbook: 17:3.B