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comp / comp.text.pdf / Re: timestamp in ps2pdf

Subject: timestamp in ps2pdf
From: LC's No-Spam Ne
Newsgroups: comp.text.pdf, comp.text.postscript
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Date: Mon, 15 Apr 2024 11:41 UTC

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Subject: timestamp in ps2pdf
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A few times it happens to me that I have to "reissue" a LateX document
fixing a mistake (e.g. a wrong figure included) WITHOUT altering the
original issue date.

What I do is to write "fix" inside the LateX timestamp with e.g.
\renewcommand{\today}{January 27, 2024 (fix)}

Then I run latex (tex->ps) and ps2pdf (ps->pdf)

Then use touch --reference=WrongOrOldReports/old.* new.*
to backdate the Unix timestamp.

I've noticed that the Postscript file keeps track of the REAL date e.g.
%%CreationDate: Mon Apr 15 11:18:06 2024

I wonder if also the pdf has (encoded ? I cannot find it in clear) the
actual date.

(X-post to ps and pdf NG, followup to pdf only)

Subject: Re: timestamp in ps2pdf
From: Stefan Ram
Newsgroups: comp.text.pdf
Organization: Stefan Ram
Date: Mon, 15 Apr 2024 19:06 UTC
References: 1

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From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.text.pdf
Subject: Re: timestamp in ps2pdf
Date: 15 Apr 2024 19:06:37 GMT
Organization: Stefan Ram
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LC's No-Spam Newsreading account <nospam@home.invalid> wrote or quoted:
>I wonder if also the pdf has (encoded ? I cannot find it in clear) the
>actual date.

PDF files can contain dates for several subobjects and the
whole document. For example, "14.3.3 Document Information
Dictionary" in "Document management — Portable document
format — Part 1: PDF 1.7" describes the document information
dictionary with it's "CreationDate" and "ModDate" in table 317.

Sometimes, such dates in PDFs are kind of compressed, and
one needs to use tools to render the compressed "streams"
visible, like, for example, "mutool" of "mupdf".

Subject: Re: timestamp in ps2pdf
From: Peter Flynn
Newsgroups: comp.text.pdf
Organization: Usenet Labs Bozon Detector Facility
Date: Fri, 26 Apr 2024 21:28 UTC
References: 1

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From: peter@silmaril.ie (Peter Flynn)
Newsgroups: comp.text.pdf
Subject: Re: timestamp in ps2pdf
Date: Fri, 26 Apr 2024 22:28:41 +0100
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On 15/04/2024 12:41, LC's No-Spam Newsreading account wrote:
[...]
> I wonder if also the pdf has (encoded ? I cannot find it in clear)
> the actual date.

pdfinfo -isodates filename.pdf

This should list all the metadata including the embedded CreationDate.

Peter

Subject: Re: timestamp in ps2pdf
From: LC's No-Spam Ne
Newsgroups: comp.text.pdf
Organization: myself !!
Date: Sat, 27 Apr 2024 16:03 UTC
References: 1 2

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From: nospam@home.invalid (LC's No-Spam Newsreading account)
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Subject: Re: timestamp in ps2pdf
Date: Sat, 27 Apr 2024 18:03:50 +0200
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Subject	Author
timestamp in ps2pdf	LC's No-Spam Newsreading account
Re: timestamp in ps2pdf	Stefan Ram
Re: timestamp in ps2pdf	Peter Flynn
Re: timestamp in ps2pdf	LC's No-Spam Newsreading account