Getting expiration date of client certificate

Server NGINX
1

Hi,
I wanted to extract client certificate expiration date in nginx.conf.
I
have the below map command to extract CN name of client certificate. Do
you
know if any variables/directives nginx supports to extract client
certificate expiration date?

map $ssl_client_s_dn $ssl_client_s_dn_cn {
default “”;
~/CN=(?[^/]+) $CN;
}

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