How do I get rid of the "This Connection is Untrusted" message?

I have used my firefox browser for 1 1/2 without any problems. Now all the sites I go to give me the warning message that "This Connection is Untrusted." I can no longer access email or my university website to see my grades- nothing works. Even when I click that I understand the risks and verify the certificate, I can still only get so far- but it's never all the way to where I need to be.
How can I get rid of this annoying problem?

Thanks jscher2000 and cor-el for your help! It turns out it was a date and time issue. I'm glad to say it's all fixed now! Thanks again!

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