# Adding timestamps in latex documents to mark when document was written, not compiled?

I expect it cannot be done since there's no way for LaTeX to know when the source was changed, but I thought I'd ask anyway.

Is it possible to automate the addition of timestamps to LaTeX documents that mark the time the document was written (not compiled)?

```\usepackage[colorinlistoftodos,prependcaption,textsize=scriptsize]{todonotes}

% My notes
\newcommandx{\unsure}[2][1=]{\todo[linecolor=Orange,backgroundcolor=Orange!25,bordercolor=Orange,#1]{AS:\@ #2}}
\newcommandx{\change}[2][1=]{\todo[linecolor=Aquamarine,backgroundcolor=Aquamarine!25,bordercolor=Aquamarine,#1]{AS:\@ #2}}
\newcommandx{\info}[2][1=]{\todo[linecolor=OliveGreen,backgroundcolor=OliveGreen!25,bordercolor=OliveGreen,#1]{AS:\@ #2}}
\newcommandx{\tocite}[2][1=]{\todo[linecolor=green,backgroundcolor=green!25,bordercolor=green,#1]{AS:\@ To cite: #2}}
```

However, when collaborating over the document, it'll be useful to know the chronological order in which these comments were added also---to make them more conversation like.

We use git, so we do have some idea of the order, but having it included in the document itself would be very useful.

Edit: would there be a `pre or post-compile-hook` type thing that would replace a placeholder text with the current time stamp, for example?

• I do something similar using `subversion`, it can insert data stamps into the file at the time of subversion commit, these can then be access via for example the `svn-multi` package (see PracTeX Journal 2007, issue 3 for information about this approach). I assume something similar exists for `git` – daleif Dec 11 '18 at 11:49
• Yes, I expect it should be doable using git pre-commit hooks, but I was wondering if there was a "native" LaTeX way of doing it that wouldn't require all collaborators to install the hooks and so on. I don't think we can modify Overleaf's hooks, for example. – FranciscoD Dec 11 '18 at 12:06
• Well, LaTeX packages like gitinfo2 are using the hooks. – TeXnician Dec 11 '18 at 15:10
• It uses a post-commit hook, so the addition of the git info will not be in the committed version. Hence the question about a pre or post compile hook instead of a git hook. – FranciscoD Dec 18 '18 at 22:32