Validity of DigiCert certificates will be limited to one year
From 1 September 2020, all CAs must stop issuing two-year SSL / TLS certificates. The maximum validity period for SSL certificates is now 1 year (398 days to be precise).

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From 1 September 2020, all CAs must stop issuing two-year SSL / TLS certificates. The maximum validity period for SSL certificates is now 1 year (398 days to be precise).
Dean Coclin, chairman of the CA/Browser Forum, has posted on Twitter the announcement that Google will follow Apple's lead in limiting the validity of public SSL/TLS certificates to one year. This decision was not a surprise, since Google has always been the main supporter of short-lived certificates.
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On 30 May 2020, the validity of the root certificate AddTrust External CA Root from Certification Authority Sectigo (formerly Comodo) expired, as well as intermediate certificates USERTrustRSA and Comodo RSA CA, signed by this root certificate.
As a result of the coronavirus pandemic, major browsers have decided to temporarily extend support for legacy TLS 1.0 and 1.1 protocols. Similar plans have also been expressed by the developers of Firefox, Chrome and Edge.