Markdown metadata for date field is all in 1970

[stefmolin]

I just noticed that the date field in the metadata for several Markdown files (for example tutorials/publish-conda-forge.md) states they were written in 1970. It looks like these were introduced in #488.

[stefmolin]

For my website, I use a tool in my GitHub Actions workflow to restore the modified time to my post Markdown files so that the RSS feed always has the true last modified time:

- name: Checkout
  uses: actions/checkout@v4
  with:
    fetch-depth: 0  # need to fetch all commits for git restore-mtime

- name: Restore timestamps
  run: sudo apt-get install git-restore-mtime && git restore-mtime

Then, you can remove this field from the metadata of each file, and in Python, you can do Path(file).stat().st_mtime to grab the timestamp for your RSS feed (see https://docs.python.org/3/library/pathlib.html#pathlib.Path.stat).

[ucodery]

Pinging @sneakers-the-rat. This is odd, but it looks like the frontmatter you added got some generated dates? It looks to me like it was something akin to date.fromtimestamp(0) + file_enumeration_index. I don't see anything like that in your PR, but it might have been a script you used before commit?

[sneakers-the-rat]

Lol no those were just placeholder dates intended to be replaced with actual dates

I dont think I changed the mtime, but this would probably do it: https://github.com/pyOpenSci/python-package-guide/pull/488/files#diff-77763db26eb3ad9b3f8b8b9104c9ec0b97bbc5d264f644f811803ca1381616a1R4