For about 3 days, I got a notification when I try to open my POP3-email (gmail)    “pop.gmail.com  is a site that uses a security certificate to encyript data during submission, but its certificate will not be valid ….”

server_certificate_not_yet_valid

 

Yahoo Messenger gave me the same notification, “The security certificate has expired or is not yet valid”

security_alert

 

when I open https site I got notification “Secure Connection Failed …”

secure_connection_failed

 

I thought there were some errors on my browser or might be there were a virus in my computer, lately I got the explanation, I changed my date 7 years earlier (for testing my code that use computer time) but I forgot to return it to the recent date.

date_and_time_properties