[gnutls-devel] Guile-GnuTLS | year 2038 problem in x509-certificate-*-time (#32)

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Dariqq commented: https://gitlab.com/gnutls/guile/-/issues/32#note_2374215747


This might not be a problem with guile-gnutls but rather with gnutls itself as the `time_t` value returned by `gnutls_x509_crt_get_expiration_time` is already negative, and `scm_from_int` just converts that to `SCM`. Trying to use the `set-*!` variants with a big or small enough time value leads to a gnutls exception:

```scm
(use-modules (gnutls))
(let ((cert (make-x509-certificate))
      (expiration (expt 2 31)))
  (set-x509-certificate-expiration-time! cert expiration))
;; In procedure raise exception:
;; Value out of range -2147483648 to< 2147483647: 2147483648
```
Which are `-2^31` and `2^31 - 1` and 


Not sure where things get truncated to 32bits. I'll report to them

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