🚀 go-pugleaf

What exactly are you trying to do? While I agree there's no PORTABLE way to get the current date&time from PostScript
code, this can be done with Acrobat Distiller, with GhostScript and with Jaws PDF Creator.

However, there are other problems I see. You say "rename of exist PDF file before PS file running". Does this mean
"automatically backup (by changing its name) an older version of a PDF while creating a newer version"? This is not
likely to be done from PROLOG.PS, because PROLOG.PS is not procesed separately from, but as part of, the "main"
PostScript file. At the time Distiller executes your "rename", the old PDF file may have already been overwritten, and
definitely the new one is not yet available. A second problem: PROLOG.PS cannot figure out automatically the name of the
old file.

That being said, why not use some kind of operating-system level scripting (batch file, shell script, Windows Script
Host) to do the rename and then launch Distiller (or whatever converter you use)?