I'm getting this error message: NET::ERR_CERT_DATE_INVALID

Hi there teachmetech1,

Thanks for joining us in Apple Support Communities! We understand you're unable to access some websites in Safari on your Mac. We're glad you're here, and we can provide some guidance.

You'll want to start by working through the suggestions here:

If Safari on Mac doesn't open a webpage or isn’t working as expected

If that doesn't seem to help, try the additional steps in this link:

If you can’t open a website in Safari on Mac

Let us know how it goes.

Cheers.