ossl_x509_get_not_after  718 ext/openssl/ossl_x509cert.c     rb_str_append(str, rb_inspect(ossl_x509_get_not_after(self)));
ossl_x509_get_not_after  754 ext/openssl/ossl_x509cert.c     rb_define_method(cX509Cert, "not_after", ossl_x509_get_not_after, 0);