The dates associated to documents in the Nimonik library, and also used in the Library Updates report, are defined in the following way:
Published Date – The date on which the document was published
Nimonik Publication Date – The date on which the document was added to the Nimonik library
Modified Date – The most recent date on which the document was modified by the issuing authority
In Force Date or Effective date – The date on which the obligations outlined in the document come into effect
Hovering your mouse over the “i” icon next to the date title will allow you to view these definitions while using the Nimonik app.