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Publication date (editing books)

This field is for noting the date the edition associated with the listed ISBN was published. Date published can most usually be found on the copyright page of a book. That page will tell you when the work was copyrighted - and if the book is a first edition, the copyright date will be the same as the date published. If it is a later edition, the date will be different. Some books, not all, will list dates for subsequent publications somewhere on the copyright page. The last date listed is what should be used to fill in the date published. If you know the book is a reprinting/reissue published later than the copyright date, but no other dates are given you can A) if the book already has a date published supplied by Ingram, leave it as is; B) research the publication date for the edition you have using Worldcat, Library of Congress, the author's website or numerous other resources; or C) use the copyright date as the date published.

      year: 2008
      month: September
      day: 22

Adding the month and day are optional. They should be included if known. Year is also technically optional, but it is strongly encouraged that a year always be included. Note: All publication dates must follow the Gregorian or Julian calendar.