Safari keeps saying that the certificate for My Yahoo can't be trusted

Suddenly today when I try to sign in to "My Yahoo" I get the message that Safari doesn't trust the certificate. Is this a real problem or some glitch?

Quit Safari.
Open Keychain Access (Applications/Utilities)
Select: Certificates on the left. (not My Certificates)
Double click the Yahoo certificate.
Where you see Trust; click the gray disclosure triangle so it faces down.
Click the pop up menu to the right of: When using this certificate
Select: Always Trust
Quit Keychain Access. Relaunch Safari. Try logging in to Yahoo.
Also, go to System Preferences - Date & Time then select Date & Time.
Make sure: Set date and time automatically is selected.

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Safari keeps saying that the certificate for My Yahoo can't be trusted

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