证书过期

With the rapid development of science and technology, many modern technologies have become more and more pervasive. Among them, the technology of using digital certificates has become increasingly popular in people's daily life.
Digital certificates are issued by authentication centers, which are used to prove the identity and trustworthiness of certificates. It can be used in many areas such as finance, online payment and online shopping. With a digital certificate, one can enjoy a secure, safe and efficient network environment.
However, it should be noted that the valid time for digital certificates is 730 days. If there is no extension after expiration, the digital certificate will be invalid. Once expired, the user's data cannot be used, and the resources which require the user's digital certificate authentication will not be accessible.
Therefore, if you have obtained a digital certificate, please remember to extend it before it expires. If the digital certificate is expired, please go to the authentication center to apply for certificate extension. Do not delay, or else it might bring inconvenience to your life.