Answer by fisprak for Displaying a remote SSL certificate details using CLI tools

In addition to @jpbochianswer:

$ gnutls-cli --print-cert serverfault.com < /dev/null | openssl x509  -inform pem -noout -text -dates

Output

Certificate:    Data:        Version: 3 (0x2)        Serial Number:            03:67:98:53:7f:1f:64:c2:2c:8f:57:d8:17:96:01:e8:6d:30        Signature Algorithm: sha256WithRSAEncryption        Issuer: C = US, O = Let's Encrypt, CN = R3        Validity            Not Before: May  8 13:13:04 2022 GMT            Not After : Aug  6 13:13:03 2022 GMT        Subject: CN = *.stackexchange.com        Subject Public Key Info:            Public Key Algorithm: rsaEncryption                Public-Key: (2048 bit)                Modulus:                    00:ad:46:73:ad:d6:1d:be:56:a0:aa:bf:1d:a6:e0:                    62:ed:45:b4:d1:81:d2:aa:53:1d:de:db:48:6c:bc:                    7b:37:53:3d:d2:9a:ae:50:a8:78:ae:c2:c1:c0:70:                    c1:c7:de:55:91:6d:d0:22:07:71:73:61:d9:a7:9c:                    f9:c6:6b:40:42:ce:b6:69:05:18:32:b1:34:61:40:                    69:3b:88:5b:aa:33:da:8f:0f:ad:eb:c2:9f:02:92:                    cf:76:2e:39:8f:b9:66:a6:12:9f:34:a4:e9:13:fc:                    3f:e0:53:89:e1:43:32:24:62:54:af:6e:44:57:4b:                    a5:6d:74:a5:ef:98:e0:42:66:13:f8:64:2b:2c:3c:                    0c:54:d5:18:d8:51:60:73:db:59:9d:c5:05:b0:8f:                    53:74:ec:55:e0:2f:21:0f:79:49:73:a0:d9:f0:ae:                    d3:17:e2:3d:50:fb:cf:d9:81:5c:23:6a:fa:ae:8f:                    92:f4:42:af:95:b3:28:80:d9:db:f5:68:16:f5:eb:                    2d:84:91:2a:ad:d7:9d:c4:f6:91:83:08:8e:bc:cd:                    27:8c:d5:2d:ea:71:34:2d:9e:d9:fd:59:46:33:f6:                    b0:c4:e5:fa:a6:0b:09:6d:cb:7c:aa:de:01:b0:52:                    3b:af:87:fa:b6:16:52:4a:45:54:1e:ce:4d:68:e4:                    d0:89                Exponent: 65537 (0x10001)        X509v3 extensions:            X509v3 Key Usage: critical                Digital Signature, Key Encipherment            X509v3 Extended Key Usage:                 TLS Web Server Authentication, TLS Web Client Authentication            X509v3 Basic Constraints: critical                CA:FALSE            X509v3 Subject Key Identifier:                 8F:95:08:25:6C:87:32:5C:2C:BC:C7:2D:30:1E:69:F5:26:36:BF:D7            X509v3 Authority Key Identifier:                 14:2E:B3:17:B7:58:56:CB:AE:50:09:40:E6:1F:AF:9D:8B:14:C2:C6            Authority Information Access:                 OCSP - URI:http://r3.o.lencr.org                CA Issuers - URI:http://r3.i.lencr.org/            X509v3 Subject Alternative Name:                 DNS:*.askubuntu.com, DNS:*.blogoverflow.com, DNS:*.mathoverflow.net, DNS:*.meta.stackexchange.com, DNS:*.meta.stackoverflow.com, DNS:*.serverfault.com, DNS:*.sstatic.net, DNS:*.stackexchange.com, DNS:*.stackoverflow.com, DNS:*.stackoverflow.email, DNS:*.superuser.com, DNS:askubuntu.com, DNS:blogoverflow.com, DNS:mathoverflow.net, DNS:openid.stackauth.com, DNS:serverfault.com, DNS:sstatic.net, DNS:stackapps.com, DNS:stackauth.com, DNS:stackexchange.com, DNS:stackoverflow.blog, DNS:stackoverflow.com, DNS:stackoverflow.email, DNS:stacksnippets.net, DNS:superuser.com            X509v3 Certificate Policies:                 Policy: 2.23.140.1.2.1                Policy: 1.3.6.1.4.1.44947.1.1.1                  CPS: http://cps.letsencrypt.org            CT Precertificate SCTs:                 Signed Certificate Timestamp:                    Version   : v1 (0x0)                    Log ID    : DF:A5:5E:AB:68:82:4F:1F:6C:AD:EE:B8:5F:4E:3E:5A:                                EA:CD:A2:12:A4:6A:5E:8E:3B:12:C0:20:44:5C:2A:73                    Timestamp : May  8 14:13:04.851 2022 GMT                    Extensions: none                    Signature : ecdsa-with-SHA256                                30:44:02:20:39:CE:40:26:A2:CE:3E:80:70:EC:13:8E:                                70:BF:21:33:1F:9A:17:67:6B:46:6B:DC:BC:55:57:E7:                                4B:CC:5E:2C:02:20:2F:B5:07:A1:63:56:34:FB:FE:20:                                AC:05:62:1B:1F:FA:FD:2F:EC:2C:E9:F6:96:87:A5:B7:                                85:E4:FC:C2:0B:2D                Signed Certificate Timestamp:                    Version   : v1 (0x0)                    Log ID    : 46:A5:55:EB:75:FA:91:20:30:B5:A2:89:69:F4:F3:7D:                                11:2C:41:74:BE:FD:49:B8:85:AB:F2:FC:70:FE:6D:47                    Timestamp : May  8 14:13:04.897 2022 GMT                    Extensions: none                    Signature : ecdsa-with-SHA256                                30:45:02:21:00:F8:AA:7D:72:B4:E2:FB:C1:E2:31:98:                                83:33:AD:17:32:C8:CD:C7:E4:3B:2A:3D:61:73:AC:BC:                                69:26:B4:7C:95:02:20:55:DA:0A:4C:27:E3:9B:39:96:                                88:07:BF:7D:5A:B7:DC:83:E7:7D:14:AE:E8:76:28:48:                                A7:D5:89:47:19:B4:47    Signature Algorithm: sha256WithRSAEncryption    Signature Value:        a0:f9:b8:ff:b3:1e:c6:ba:e5:bd:ab:62:d5:b9:76:09:97:41:        ef:69:b2:48:1a:87:f6:98:7b:03:0e:03:15:0d:50:15:9c:6c:        0d:b8:4c:34:5d:fc:a6:98:b4:40:71:48:60:d1:67:21:af:e5:        da:9c:e6:35:83:c4:53:4b:8b:1a:f1:ee:54:ef:85:48:f5:c3:        a5:9d:9e:69:ec:45:40:23:3b:e2:d8:2c:0d:70:58:91:a7:82:        5f:e7:5e:4b:6a:f6:ab:dc:ea:b1:12:9d:83:b2:95:79:99:ef:        4e:f4:41:9f:8e:21:49:c3:61:e0:9d:f1:e9:6a:96:b2:33:7e:        04:66:d2:29:fe:c1:a0:b8:3d:95:c2:68:28:f1:87:e3:99:cd:        18:34:89:9e:9e:99:ca:03:69:1c:7e:4d:41:90:96:2c:3e:b2:        36:d7:0c:48:b5:5f:c7:5b:93:d3:ff:35:a3:51:ff:10:af:ac:        cf:7d:cd:6d:ab:5b:d6:8a:21:a5:bd:b0:24:9c:2f:bd:65:fd:        05:d6:cf:6f:a1:67:77:06:a6:54:b6:9e:0c:5e:cc:2a:28:f8:        af:f0:9e:02:f8:28:f6:74:47:3f:d2:db:6a:6c:23:cf:53:61:        de:eb:91:8b:42:28:e4:d6:f3:75:56:d3:41:fd:68:ed:fd:a3:        7f:14:7e:dbnotBefore=May  8 13:13:04 2022 GMTnotAfter=Aug  6 13:13:03 2022 GMT