I don’t know what you have been trying (as always, some MWEs would have been immensely helpful), but for me pandoc works as expected:

With the following `test-date-bce.bib`:

@article{item1,
author = {Doe, Jane},
date = {-0349~},
title = {The Title},
}

running the following script:

pandoc -F pandoc-citeproc -t plain << EOT

Blah blah blah [@item1].

---
# csl: water-sa.csl
bibliography: test-date-bce.bib
reference-section-title: References
...
EOT

outputs the following:

Blah blah blah (Doe 350BC).

REFERENCES

Doe, Jane. 350BC. “The Title.”

(Try uncommenting the water-sa.csl line to see that rendering a term for “circa” is possible, too; this just hasn’t been implemented in the default chicago-author-date.csl and many other styles. You may want to report this as a bug at https://forums.zotero.org/, together with the missing space in front of “BC”. Suggesting the use of “CE/BCE” as default terms might be a good idea, too.)

As to latex, you’d best provide us with an MWE of your own.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On June 27, 2018 6:08 AM, Steve Petersen <spetey-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Thanks for the help - I had found the page you pointed me to, Joseph, but didn't find my solution on skimming.
>
> Alas the '{-0349~}' version doesn't work in either LaTeX or pandoc. (It gives "Aristotle (-0349)" in LaTeX, and "n.d." in pandoc.)
>
> I should confess I understand very little of citeproc / csl. Digging around it looks like it uses 'chicago-author-date.csl' as default, but I didn't see a natural place to add the lines suggested.
>
> For what it's worth, I also noticed LaTeX does not handle "{circa 350 BCE}" all that well; though it shows up fine in the bibliography, the inline citation shows as "Aristotle (BCE)".
>
> Thanks again for any further thoughts.
>
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