jab main apna browser on karta hon to ye msg aata hai

The server's security certificate is not yet valid!
You attempted to reach www.********.com, but the server presented a certificate that is not yet valid. No information is available to indicate whether that certificate can be trusted. Google Chrome cannot reliably guarantee that you are communicating with www.********.com and not an attacker. Your computer's clock is currently set to Wednesday, March 14, 2012 11:49:28 AM. Does that look right? If not, you should correct your system's clock and then refresh this page.
You should not proceed, especially if you have never seen this warning before for this site.
{Proceed anyway }{Back to safety}
Help me understand