Represents the "ModDate" entry of the embedded file parameter
dictionary object.
It is an optional entry defined as part of the PDF 1.0
specification.
It contains a string representing a PDF string object.
This is encoded as a date string. For details see the
StringAtom.DateToString and
StringAtom.StringToDate functions.
For definitive details see:.
The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 46,
page 104.
The ISO PDF
Specification, ISO 32000-2:2017 PDF 2.0; Table: 45, page 137.
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