Is there any way to add a timestamp/datestamp to the server console?  If certain things happen, it would be nice to be able to see WHEN they happened.

Set MinimalistMode to false in oxide.config.json. This would only apply to Oxide messages.

Yeah, I need to know when someone gets killed, joins, disconnects, etc.

I'd suggest a logging plugin that outputs that information along with time stamps. Oxide doesn't provide that information natively.

Could you point one out that does this?

RustAdmin RCON tool.