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1You attempted to reach gmail.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 gmail.com and not an attacker. You should ensure that your clock and time zone are set correctly on your computer. If they are not, you should correct any issues and refresh this page. If they are correct, you should not proceed.
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3Help me understand
4When you connect to a secure website, the server hosting that site presents your browser with something called a "certificate" to verify its identity. This certificate contains identity information, such as the address of the website, which is verified by a third party that your computer trusts. By checking that the address in the certificate matches the address of the website, it is possible to verify that you are securely communicating with the website you intended, and not a third party (such as an attacker on your network).
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6Certificates have a validity period, much like any identity document (such as a passport) that you may have. The certificate presented to your browser is not yet valid. When a certificate is outside of its validity period, certain information about the status of the certificate (whether it has been revoked and should no longer be trusted) is not required to be maintained. As such, it is not possible to verify that this certificate is trustworthy. You should not proceed.