DOC: timezone warning for dates beyond TODAY
introducing a suggestion discussed in PR #33863 :
Added a warning in the user guide that timezone conversion on future dates is inherently unreliable.

- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] passes `black pandas`
- [ ] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [ ] whatsnew entry

what is the status here? LGTM. Just looks like master needs to be merged in > what is the status here?

I don't have a working dev environment and no time to set it up. I also tried to figure out if this can be done on Github only (without using my local machine) but couldn't find a way to merge master into my GH repository online. Feel free to take over the PR and fix the one CI error it still throws. Or I'll get to it when I get to it -- that is sometime this year. I merged in master but there are again CI failures unrelated to the docs. Why is it so hard to get a simple doc change in? > LGTM. Just looks like master needs to be merged in

Have merged master, CI passes now - still happy with it @mroeschke ? Thanks @joooeey !