A "creation date" is defined as the date and time a stream of data bytes
was created.  (Some systems call this a "last modified date".)  Editing
some data changes its creation date.  Moving the data between volumes or
machines does not.

The IFF standard date format will be one of those used in MS-DOS,
Macintosh, or AmigaDOS (probably a 32-bit unsigned number of seconds since
a reference point).  Issue: Investigate these three.