[XeTeX] Producer entry in info dict

[Heiko Oberdiek]

On Wed, Feb 29, 2012 at 12:24:11AM +0100, Zdenek Wagner wrote:

> 2012/2/28 Ross Moore <ross.moore at mq.edu.au>:
> >
> > On 29/02/2012, at 8:44 AM, Heiko Oberdiek wrote:
> >
> >> ...
> >
> > BTW, what about the  /CreationDate  and  /ModificationDate ?
> > Surely these should be set automatically too ?
> > Doesn't  pdfTeX  have the means to do this?
> >
> Both /CreationDate and /ModDate can be added by macros and both are
> required by PDF/X. PdfTeX adds both automatically including the time
> zone. Dvips adds none, thus my zwpagelayout package adds them if dvips
> is used. TeX does not supply at a macro level the time zone, so that
> the time zone is not used. Xdvipdfmx sets /CreationDate only and
> zwpagelayout sets /ModDate. The problem is that /CreationDate set by
> xdvipdfmx contains time zone while /ModDate set by the macros does
> not. Time information without a time zone is considered UTC. Depending
> on the user's time zone upon PDF/X validation it may be reported that
> the file was modified before it was created.

This kind of trouble is the reason for pdfTeX's \pdfcreationdate.
It expands to the string that pdfTeX uses in the info dictionary
including the time zone. It can also be used in DVI mode.

Yours sincerely
  Heiko Oberdiek