Remove published date from source code

I have a online encyclopedia that has lots of terms in it. It’s been around a while, so some entries are pretty old. Google is displaying a date on my snippets now, and the older dates turn off searchers. The content is continuously refreshed, but the original date is displaying instead of updates. I’ve used CSS to mask the dates in the header, but the dates are still in the source code.
How do I get rid of the dates there? I want to make sure I’m not inadvertently giving google incorrect dates. I’ve been trying to find the location in the code where this is called (I know–bad practice, but desperate times…).

Thanks
JT