OptionalauthorOptionalcategoryOptionalcommentsOptionalcompanyOptionalcontentOptionalcreationOptionalcustomOptionalkeywordsOptionallastOptionallastWhen the workbook was last saved, as the file it was read from says.
OptionallastWhen the workbook was last printed, as the file it was read from says.
OptionalmanagerOptionalrevisionOptionalsubjectOptionaltitle
The serialized form. Dates are ISO 8601 strings in UTC.