alt Hacker NewsDoesn't seem to me like it is telling the printer what day of the week it is because the printer needs to know so much as it is generating a PostScript file for the printer to use and is adding the creation date as either a convention or requirement of the format, and not the printer.
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bombcar • yesterday at 6:23 PM
Exactly, it was using the file utility to determine what it was so it could print it correctly (by processing it if needed to a format the printer understood) and there was a bug in that.
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gpvos • yesterday at 6:33 PM
Not a requirement, but indeed more of a convention or at least a possibility. Postscript files can be postprocessed or read by humans, and then this kind of metadata can be useful.
Other things were reported to successfully be printed on Tuesdays, so that inclusion (or at least, this form of it) is empirically unnecessary.
And the whole CreationDate field is optional in PostScript[1], anyway.
[1]: https://www.adobe.com/jp/print/postscript/pdfs/PLRM.pdf