The publisher or author named the date, and two retailers agree.Two or more independent sources agree, with no publisher or author statement.A window is named, such as spring 2027, but no day.A retailer holds a slot with a dummy date, never shown.No source gives a date at all.One source states the date, so the check is not finished.The book is out, and a source still states that date.The release day moved later than the day the site published.