# [OS X TeX] Re: Save date-time, not Print date

Robert Bruner rrb at math.wayne.edu
Sat Jan 6 18:20:33 CET 2007

```> Surely you missed
>
> B. Towards the begining of the thread, Kock wrote: "In my opinion, the
> \date command in latex is not particularly useful: often it is quite
> uninteresting and confusing to know when the dvi or pdf file was
> compiled -- the interesting bit of info really is the time the source
> hard disc and compile it, it will get today's date stamp, even though
> the file was last modified several years ago" which is exactly the issue
> as far as I am concerned.

The command (in Terminal)

ls -lT air.tex | awk '{print \$8" "\$7" " \$6" "\$9}'

returns the 3 strings (in this example)

12:19:06 10 Dec 2006

which is the last time the file air.tex was modified.
It should be simple to have TeX (with shell-escape) capture
this information and use it, rather than the time at which
tex was invoked.  I don't know this sort of tex programming,
but would be surprised if it weren't already available somewhere.

Bob Bruner