> lyxerr << (pdfname.lastModified() > dviname.lastModified());
> lyxerr << (int(pdfname.lastModified()) > int(dviname.lastModified()));
> 

and from the Qt documentation:

  uint QDateTime::toTime_t () const

  If the date is outside the range 1970-01-01T00:00:00 to
  2106-02-07T06:28:14, this function returns -1 cast to an
  unsigned integer (i.e., 0xFFFFFFFF).

Vincent

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