Fix timestamp depreciation warning (again)

[EdwardSafford-NOAA]

Fix timestamp deprecation warning in csv_data.py. This was fixed once but the file change was apparently lost during the confusion with the CI test failures.

Close #201

[CoryMartin-NOAA]

The documentation build is failing. Not sure if it is related to this PR or something else... Looks like it is failing on something in here:https://github.com/JCSDA-internal/eva-docs/tree/develop/.github/workflows Always something to chase with these GitHub Actions...

[EdwardSafford-NOAA]

The EVA documentation dry run failure report is:

Error while loading conda entry point: conda-libmamba-solver (libarchive.so.19: cannot open shared object file: No such file or directory)

CondaValueError: You have chosen a non-default solver backend (libmamba) but it was not recognized. Choose one of: classic

From what I read on stackoverflow this can be fixed by modifying the conda install in eva-docs/.github/workflows/docs_dry_run.yaml to make the install line something along the lines of conda install --solver=classic conda-forge::conda-libmamba-solver conda-forge::libmamba conda-forge::libmambapy conda-forge::libarchive.

I'm not sure how to make that change to eva-docs and then test it in eva without first merging it into eva-docs/develop. Need some help there.

[CoryMartin-NOAA]

I'm not sure how to make that change to eva-docs and then test it in eva without first merging it into eva-docs/develop. Need some help there.
I think that's basically what we have to do @EdwardSafford-NOAA , and revert if we broke something.

[EdwardSafford-NOAA]

Ok, I'll create a PR in eva-docs to do this and we'll start a bit of trial and error.

[EdwardSafford-NOAA]

@CoryMartin-NOAA the documentation test is passing today. I'm not going to ask any questions; I suggest we declare victory and move swiftly on.

[CoryMartin-NOAA]

🎉