Last DIF Revision Date


The <Last_DIF_Revision_Date> specifies the date the metadata record was created.  The <Last_DIF_Revision_Date> is automatically populated by the authoring tools with the date the metadata entry was created or modified, however, the author may change the date.


<Last_DIF_Revision_Date>yyyy-mm-dd</Last_DIF_Revision_Date >

Year, month and day must follow the International Standard ISO 8601 in the form: yyyy-mm-dd, where:

yyyy= the 4 digit year
mm= the 2-digit month (01 – 12)
dd = the 2-digit day (01-31)

  • The <Last_DIF_Revision_Date> is recommended and may not be repeated.


This document should be cited as:
Directory Interchange Format (DIF) Writer's Guide, 2015.
Global Change Master Directory.
National Aeronautics and Space Administration.

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